By order I got them in

DS: Metroid Prime Hunters: First Hunt (seriously wanted that demo) Mario 64 DS

Worth it?  For the demo no for everything else hell yes most played system ever

Wii: Zelda TP Wii Sports

Worth it?  For two of the best games in the past 5 years?  Yep then there's been so many other great games to go along with it since then

PSP: Final Fantasy VII Crisis Core

Worth it?  Crisis Core is no where near a game you buy a whole console for, since then I have enjoyed a few sony games on the go Ape Escape is probably my favorite game on the system and it's a PS1 port (which is also one of my favorite PS1 games lol) so verdict so-so?

PS3: Little Big Planet

Worth it?  Yessir! LBP is still endless fun and one of the few local multiplayer games on the system sadly, and then there are some other good games I've picked up since then.

Upgraded my PC: Left 4 Dead (had the PC for over a year now but it was for SCII when it was supposed to come out in 2009) 

Worth it?  Left 4 Dead is simply pure fun, mods are great, and now all these Steam games I can play, just pure awesome

360: Lost Odyssey 

Worth it?  Much like Crisis Core it's not something to buy a console for however I got the 360 for nothing out of pocket, still not a whole lot of 360 exclusives I would say is worth the investment, though for people just wanting multiplatform games its the cheaper option and a good idea, for me not so much but I just bought Banjo and Viva Pinata to see how those games are :P 

Wii - The main game I wanted was Zelda but I would have bought it anyway because it's tradition for me to buy Nintendo consoles on launch.

360 - Dead or Alive 4

DS - Mario 64

PS3 - No games really, I just bought it because the PS2 was so good. It was a bad decision >_< I got it on launch with Ninja Gaiden Sigma for £425, waste of money at the time imo. It died 2 years later when the warranty ran out =P and now it's too expensive to fix.  It's the only console that's worse than it's predecessor this gen imo. It's still good though and I need it fixed to play FF XIII.

PSP - Dissidia and Crisis Core

I'm a puzzle game fan...assuming they are fun, deep, challenging puzzle games. I felt like the wii was best in that category with boom blox bash party and tetris party/deluxe

I like my my racers unreal and fun. Mod nation might be the best, but at the time excitebots and mariokart owned those kind of  racers...and trackmania is coming eventually.

adventure type games with zelda, mario, and metroid.

The best fighting game in Brawl.

Playing RE4 with wii controls

The hope that pikmin 3, DK, and fzero would make an appearance.

Let's recap:

Boom Blox Bash Party

Tetris Party

Zelda Twilight Princess

Super Mario Galaxy

Metroid Prime 3 Corruption

Super Smash Bros Brawl

Resident evil 4

PC covers the apparent missing shooters. Wii/PC combo is the best imo

Dude, your 360 comment... exactly my reason as well, and that was my first game as well lol

Anyhow, for the other systems:

DS: Zelda and FF4

PSP:Crisis Core

PS3: FFXIII

Wii: Mario Kart

PC: hmm, probably just because I wanted to build a new PC, if it was for a game I'd have to say FFXI or WoW

I was in stalemate beetween wanting x360 and ps3 but valkyria chronicles BR free online solved this problem ;) And from the perspective of time it was one hell of a good decision.

PSP i bought because i wanted some portable machine for games but two weeks later they anounced VC2 so this made it money well spent :D

PS3- FInal Fantasy XIII and Versus XIII. I was disappointed in the end but along the way I found many more awesome PS3 titles.

DS-FInal Fantasy III

360-Lost Odyssey

Xbox 360

Dead Rising

Wii

Metroid Prime

PS3 - MGS4 

Also got it over the XBOX 'cause of RROD, Bluray and free online play- glad I did 'cause there are more games I like on PS3 and better upcoming games IMO.

Wii - for the experience

Don't play it anymore...

PSP - Metal Gear Solid: Peace Walker

Bought a PSP last Thursday for this game and no one told me you need a memory stick to play games! (I know, I'm stupid) I bought one cheap on ebay which is hopefully coming today.

360 - Gears of War

Wii and DS - Mario

psp - psOne clasics, GT, God of War, GTA: CW

PS3 - All exclusives. 

i brought the ps3 as i wanted to upgrade my ps2 but the main games i wanted for it would be gt5 battlefront 3 though lucasarts has not offical said it is not in develoment.