Nintendo releases the same games every generation just revamped a little?  I am somewhat flabbergasted that anyone would even dare to make such an assertion.  Consider the most famous of Nintendo's legendary series:  Mario. 

NES:  Super Mario Bros. 

NES again:  Super Mario Brothers 3.  Please explain how this is "the same game just revamped a little".  It does have Mario jumping on enemies and smashing bricks, yes, but it also has a world map, Tanooki suits, items, and depth (by which I mean you can drop down behind certain panels). 

SNES:  Super Mario World.  Please explain how this is "the same game just revamped a little".  It does have Mario jumping on enemies, and yes, there are a few things he still smashes with his head.  It also has Yoshi, those colored bricks, simple 3d stuff like the fences you swap sides on, and overall many new gameplay mechanics. 

N64:  Mario 64.  If I have to explain the many, many ways in which this is a totally new Mario game compared to its predecessors, then you have no right to comment on Nintendo, having no real knowledge of it. 

GC:  Super Mario Sunshine.  You can say a lot of bad things about the FLUDD, including that it's (arguably) a gimmick, but there's no denying that it created totally new gameplay that this game used very extensively. 

Wii:  Super Mario Galaxy.  Just from the preview videos, I can say with utmost confidence that this is not 'basically the same game' as ANYTHING yet on a console, let alone any other Mario game. 

I would honestly like to get your rebuttal to my statements.  But if you come back with "But they all have Piranha Plants lol" I will take that as a concession. 

I was discussing with one friend the other day that the Mario proper series IS one of Nintendo's franchises that does see a lot of innovation. Sorry I didn't mention that.

Metroid and Zelda you could say the same, since they changed quite a bit when the moved to the GC and N64 respectively, but since then the games have stuck to essentially the same formula. The Metroid and Zelda franchises along with the Smash Bros. franchises stay pretty fun, but I can't help but feeling that they currently rely to much on the same formula. Nintendo seems to be making all of its gambles this time around with the casual market games, the one area where only a small percentage of the games appeal to me. I remain hopeful for Smash though, since the jump from the original to Melee was a FANTASTIC one.

Mario Party and Mario Kart and the Mario (fill in the blank here) games are the worst, since many of the offering on the GC were actually the worst in the history of the series (I am looking at you Mario Party and Mario Tennis). Mario Golf was pretty good though.

I see. I concede that the control schemes for Metroid and Zelda have been more or less similar since they went 3D, but that's not to say that the two series really stagnated.

Zelda OoT was followed my Majora's Mask -- a crazy experimental game IMO; then Wind Waker, also a bold move that many questioned; and finally (for now) Twilight Princess, which -- although the Light World/Dark World thing is hardly new to Zelda -- still added a lot to the franchise.

Metroid Prime was followed by MP2:Echoes, which, although derided by some, was certainly not simply "more of the same". We'll see if MP3 keeps things fresh (I believe it will). In all honesty though I must say that Metroid is probably the most vulnerable to your claim.

As for Mario Party, I never really got into it, nor do I have much direct knowledge, but if they were all the same dumb thing then why would used copies of Mario Party 5 cost the same (or MORE!) than used copies of Mario Party 6 or 7?

I don't see Mario (insert sport here) as terrible because (a) it added an original Mario-flavored take on each sport and (b) look at Madden and tell me they're derivative. Now if they start to be LIKE Madden I'll consider burning my Nintendo Club card.

Anyway, in sum, I just don't see evidence that Nintendo is letting its flagship titles go stale at all, aside maybe from Pokemon. (*Waits, cringing, to see if flamers pop out of the woodwork.*) Even if I were to concede (which I don't) that the sports titles are abominations, they are a sign that Nintendo is trying to expand its horizons.