Collection of things that could be done to improve what I love:
The Legend of Zelda: Twilight Princess
Absolutely love the game, but there's some stuff they could do.
Would have liked to see more done with Link's wolf form: Once you get the Master Sword, the wolf's only really good for a handful of things: Talking with animals (not all that useful), getting the sword techniques (occasionally handy, but short-lived), tracking scents (required, but short-lived), and attacking ghosts (good, but not quite common enough).
More use out of some items: I thought the Spinner was nifty-keen, but once you left the dungeon where you picked it up, it was pretty much useless. The same is true of the Dominion Rod.
Two words: Higher difficulty.
Armored Core 4 (Still working my way through the 1-player missions, so some might be me not used to it, yet.)
Loving it so far. I spend unhealthy amounts of time tweaking every tiny aspect of my ACs, er, Nexts, which is why I'm so slow with the missions. Game's not without its share of problems, though.
Whatever happened to the head stat of "Night Vision: Provided"? Night missions are annoying, especially since, for some reason, my targeting sights are dimmed. Hope they show up better after I get my HDMI cable from the mail and get to play in higher resolution.
Radar annoyances: Got one mission where I have to defend a ship from submarines that launch missiles that I can shoot down. Whenever I'm near the ship, it changes my radar to the zoomed-in view, preventing me from seeing the incoming missile swarms.
Default controller setups: Make sure you switch to a custom setup so that you can take lock-on out from under the left analog. Holding down the lock-on button turns off your locks and switches to manual aiming. Since in most setups, the left analog is the thing I twiddle desperately in order to not die, I sometimes accidentally hold down the L3 button during struggles. It's not fun to lose your ability to effectively retaliate when you're staring down the barrel of a bazooka. But I think I've gotten everything cleaned up.
Why did they have to trim down all the non-humanoid legs to two each? I'd like some choice for my reverse joints (thankfully, the good pair is appropriately lightweight). I imagine the Quad Squad at Armored Core Online is also annoyed.
Hopefully, downloadable content and regulation files can counteract some of those problems.
And now, just to make it clear, since I've done that complaining: I love those games and recommend them. Might want to make one note about Armored Core, though: It's got a steeper learning curve than most games, but thankfully the removal of the lock box has made combat easier... Don't expect to be able to jump right into online play, though: I suspect I'll get my tail-like rear stabilizer handed to me a few times.