I'll start with PS3:
Heavenly Sword: probably the best character models and facial motion capture I've EVER seen, but the game itself is only so-so
Ratchet & Clank Future: the usual high quality stuff. If you've played one, you've played 'em all, but in this case, that's a good thing. Got me into the old soundtracks, which are GREAT. I was also surprised to find that the Japanese voice-track is MUCH funnier than the English one.
MGS4: Best damn movie I've seen this year, and that probably won't change. Extremely mediocre game though.
Also, I bought Ninja Gaiden Sigma, but sold it shortly after. God what an atrocious piece of sh*t that was. Itagaki was right about that at least.
360, hope I'm not forgetting any:
Perfect Dark Zero: Meh. Not nearly as good as the original, obviously
Kameo Dark Elements of Power (or something): Okay. Good Soundtrack.
Enchanted Arms: LOVED it, but I seem to be the only person on the planet who did. Sequel please.
Oblivion: Holy sh*t, this game took me over 100 hours to complete and it NEVER bored me for a single second. Absolutely amazing.
Gears of War Very pretty. Very short. Very average.
Ghost Recon: Yawn
Tomb Raider Legend: Decent enough. Nothing special though. A bit too short.
Rainbow Six: Haven't played it yet
Project Gotham Racing 3 Fun enough to play through to the end. I found out I prefer Racing sims over Arcade Racers though. Which is why:
Forza Motorsport 2 was so much better. If it hadn't had a rather painful lack of variety in tracks, this would have been an absolute winner. It's at the very least much more accessible and user-friendly than the GT series.
Viva Pinata Haven't played it yet
Splinter Cell Double Agent Wow. Are you watching this, Kojima? THIS is what stealth is all about!
Dead Rising Could have been great if it wasn't so totally goddamn FRUSTRATING. Not even Megaman references can save it.
Mass Effect Awesome potential, but falls kinda short due to extremely uninspired subquests. If they polish that up for the sequel, they have a potential masterpiece on their hands.
Bioshock Best FPS ever. Period. Played through it 5 times consecutively. Loved it every single time. Worthy of all the praize it can get, although the "morality" thing is highly overrated.
Blue Dragon No, Sakaguchi. NO!
Lost Odyssey Yes, Sakaguchi. YES! More like this please.
Dead or Alive 4 It's DoA, you get what you expect.
Orange Box Best damn collection money can buy. Phenomenal stuff.
Assassin's Creed Monotonous, but engaging. Very curious to see where this goes.
Eternal Sonata This is what Namco games represent for me: Great original idea with lots of potential, executed extremely porely and boringly (see also: Katamari Damacy). A JRPG about Chopin's Deathbed!? f--- yeah! Shame they made him such a whiny preachy asshole...
So yeah, I've got slightly more 360 games than PS3 games, mostly because 360 games tend to be cheaper over here, or at least become cheap a bit sooner. Plus, I'm an achievement whore.