This one isn't a bad game per se. But God of War 3 really let me down. 2 was just leagues better.

I've been told that Too Human was lackluster.

Those are all good games , infact Liberation is their best game yet.

Hm, no mention of Doshin the Giant or Wii Music yet?

Oh, and Lair. Lair!

Level 5 and White Knight Chronicles.

You have just listed my favourite PSN game, 2 of my favourite PSP games and then MGS Peace Walker the 4th best rated PSP game on metacritic

Portable Ops.

MadWorld (Platinum Games)

Wii Music (Nintendo EAD)

Lost Planet 2 (Capcom)

Pretty much everything they've done on consoles this gen (tri-Ace)

Square-Enix has made a couple of bad games throught the years but if any one of them deserves to be mentioned here it's Unlimited Saga (better known as Unlimited Pain-in-the-butt).

That was the first thing that came to my mind. BioWare's been riding this high on Mass Effect and Dragon Age recently that gives them the aura of being the developer with the Midas touch, but Sonic Chronicles was a bad game by any standard. The only thing good in it was the core battle mechanics (that made good use of the touchscreen and formed a surprisingly cunning strategy), and everything else was butchery. Horrendous cutscenes that looked like they were made by someone who didn't really understand Flash all that well, an atrocious story even by Sonic standards which completely jumped the shark midway through when they sent everyone out to outer space adventure with random aliens, and just an overall incredibly bland and generic game-world.

BioWare was able to dodge that flop somehow, not taking a lot of heat for it. But it definitely proves that there are dregs in that group.