Milking is not purely defined by making a lot of games. Milking is making the maximum games with the minimum effort in order to gain huge profits. Guitar Hero fits this bill very nicely - none of Mario, GT or Halo fit this at all. The Mario games are almost without exception made with a lot of effort - there may be many of them but they're good and diverse games.

lol ubisoft takes the cake with this.

mario without a doubt, but we forgive it becuase the milk is usually high quality?, iuno guitar hero imagine and petz for the ds, call of duty will get fatigued by next years treyarch installment, basically any franchise activision owns gets milked into oblvion. who want to bet dj hero 2 is already in development for next year right alongside band hero 2 and guitar hero 6 and guitar hero poison or some shit. need for speed should be mentioned as well, as for most un milked franchise zelda and gran turismo deserve honorable mentions.

Mario, GH, and DW.

Dragon Ball

By this logic Megaman and Singstar are undeniable more milked than anything you listed. However, since neither has a rival fanbase they are rarely brought up in threads like these. The whole dicussion is pointless and will only be used to justify vague trolls.

According to GameFAQs:

PlayStation 2       Dragon Quest & Final Fantasy in Itadaki Street Special        12/22/04
Mobile     Final Fantasy II     02/04/05
Mobile     Final Fantasy VII Snowboarding     04/08/05
PC     Final Fantasy XI: The Vana'diel Collection     08/16/05
PlayStation 2     Final Fantasy X     09/08/05
PlayStation 2     Final Fantasy X/X-2 Ultimate Box     09/08/05
Game Boy Advance     Final Fantasy IV Advance     12/15/05
PlayStation 2     Final Fantasy XII     03/16/06
PlayStation 2     Final Fantasy XI: Treasures of Aht Urhgan     04/18/06
Xbox 360     Final Fantasy XI     04/18/06
PC     Final Fantasy XI: Treasures of Aht Urhgan     04/20/06
PSP     Final Fantasy VII: Advent Children     04/24/06
PSP     Dragon Quest & Final Fantasy in Itadaki Street Portable     05/25/06
PlayStation     Final Fantasy VII     07/20/06
PlayStation     Final Fantasy IX     07/20/06
PlayStation     Final Fantasy VIII     07/20/06
PlayStation     Final Fantasy Tactics     07/20/06
PlayStation 2     Dirge of Cerberus: Final Fantasy VII     08/15/06
DS     Final Fantasy III     08/24/06
Game Boy Advance     Final Fantasy V Advance     10/12/06
PC     Final Fantasy XI: The Vana'diel Collection 2007     11/07/06
Mobile     Dirge of Cerberus Lost Episode -Final Fantasy VII-     Q4 2006
Game Boy Advance     Final Fantasy VI Advance     11/30/06
DS     Final Fantasy Fables: Chocobo Tales     12/14/06
DS     Final Fantasy XII: Revenant Wings     04/26/07
PSP     Final Fantasy Tactics: The War of the Lions     05/10/07
PSP     Final Fantasy II Anniversary Edition     06/07/07
PSP     Final Fantasy Anniversary Edition     06/26/07
PlayStation 2     Final Fantasy XII International Zodiac Job System     08/07/07
PSP     Crisis Core: Final Fantasy VII     09/13/07
DS     Final Fantasy Tactics A2: Grimoire of the Rift     10/25/07
Xbox 360     Final Fantasy XI: Vana'diel Collection 2008     11/20/07
PlayStation 2     Final Fantasy XI: Vana'diel Collection 2008     11/20/07
PlayStation 2     Final Fantasy XI: Wings of the Goddess     11/20/07
PC     Final Fantasy XI: Wings of the Goddess     11/22/07
Xbox 360     Final Fantasy XI: Wings of the Goddess     11/22/07
DS     Final Fantasy IV     12/20/07
Mobile     Final Fantasy IV the After: Tsuki no Kikan     02/18/08
DS     Final Fantasy Crystal Chronicles: Ring of Fates     03/11/08
PlayStation 2     Odin Sphere     03/14/08
Wii     Final Fantasy Crystal Chronicles: My Life as a King     03/25/08
PC     Final Fantasy XI: Vana'diel Collection 2008     04/15/08
Wii     Final Fantasy Fables: Chocobo's Dungeon     07/08/08
PSP     Dissidia: Final Fantasy     12/18/08
Wii     Final Fantasy Crystal Chronicles: Echoes of Time     01/29/09
DS     Final Fantasy Crystal Chronicles: Echoes of Time     01/29/09
Wii     Final Fantasy II (NES)     06/16/09
Wii     Final Fantasy Crystal Chronicles: My Life as a Darklord     06/30/09
PC     Final Fantasy XI: A Moogle Kupo d'Etat     07/20/09
Wii     Final Fantasy III     07/21/09
Wii     Final Fantasy IV: The After Years     07/21/09
Wii     Final Fantasy IV     08/04/09
Xbox 360     Final Fantasy XI: A Moogle Kupo d'Etat     Q3 2009
PlayStation 2     Final Fantasy XI: A Moogle Kupo d'Etat     Q3 2009
Wii     Final Fantasy     10/05/09
DS     Hikari no 4 Senshi: Final Fantasy Gaiden     10/29/09
Mobile     Final Fantasy IV     October 2009
PC     Final Fantasy XI: Vana'diel Collection 2010     11/10/09
PlayStation 2     Final Fantasy XI: Vana'diel Collection 2010     11/10/09
Xbox 360     Final Fantasy XI: Ultimate Collection     11/12/09

That's 60 realeases with far more than 20 unique titles, and most of the Itadki Street games aren't listed and none of the many Crystal Defenders releases are listed either.  Add in Kingdom Hearts and the Chocobo games and 80+ titles have seen release that are trying to work off of the Final Fantasy franchise in the last 5 years.  In contrast, even when you count up all multiplaform releases, GH only adds up to 50 titles and a much smaller handful of spin-offs that don't share the main series name in comparison.  The match goes to Final Fantasy, slightly more milked.

Also, Mario's name pops up 50 times in titles released by Nintendo in the last five years, but since it's been milked a lot longer than GH and going full-steam longer than FF he's probably the champ in lifetime marks, especially considering the number of games that have aped popularity from Mario ranging from Donkey Kong to Wii Fit and from Punch Out!! to Smash Bros.

^Wait, Odin Sphere has nothing to do with Final Fantasy. Other than that...that's a lot of FF.

I don't know if I consider FF milked though, even if it's close. When I think of a milked franchise I think of GH or Imagine.

Granted that's a lot more than I thought there was, still, how varied are those uncrossed out games?

Just like how Mario has appeared in 50+ games, that's fine because it's not the same game over and over and over again being sold as a complete other game.  That list you have there half of them are FFXI expansion packs (and MMO expansions don't really count) and everything else is a different game with a fairly different feel.

There's a difference between a long list of games and milked.

Again, Guitar Hero is milked to death, Final Fantasy just has a lot of titles (though I would call FFVII milked to death).

Sonic would work...

Every Marios are great though.