Finished quite a few games, so I'll be very brief in my opinion of them to avoid bloating the post:
Castlevania - Lords of Shadow
Very linear, tedious and very un-Castlevania indeed.
Forgotten Realms: Demon Stone
Frustrating, amateurishly made button masher. I expected more.
Giana Sisters - Twisted Dreams
A very nice-looking platformer with some kickass music. As for the game itself, it's alright though it could do with other forms of challenge other than having spikes everywhere.
Max Payne 2
Not as good as the first one, thanks to increased focus on a not that great plot and lack of humour.
Max Payne 3
Doesn't feel like a Max Payne game. I also didn't like the increased focus on cover based shooting and the reduction of the bullet time meter. Oh, and those stupid cutscenes...
A consistently fun and entertaining action game by the same guys who brought us Judge Dredd: Dredd vs Death.
Serious Sam: The First Encounter
Too much arena based shooting. Doesn't feel like an adventure, so I disagree on it being called a spiritual successor to Doom and Duke Nukem 3D. I also don't like the fact it spends too much time on Egypt.
Serious Sam: The Second Encounter
A nice improvement over the previous game. Now it really feels like an adventure and the new weapons make the game more entertaining. It also takes place on areas other than just Egypt.
Serious Sam II
While it is certainly a very goofy game with humour that frequently falls flat, I had a lot of fun with that one. Shorter (but more) stages, new weapons and a very colourful palette make it a stark contrast to the typical Brown/Gray FPS of today.
Updated my list