I will not say that this game is awesome and bla bla bla. I will say what this game doesn't have to be 10 out of 10.
Action is superb but still this game has some puzzles that are too easy. They can be solved by any kid and this is good (for the kids). But for advanced games they are so easy that it becomes annoying when you have to punch a arrow-gun for 2 minutes and rotate it for 2 more to shoot the door. Not many of these in the game but still this is annoying and even more annoying when you replay this game. The solution to this could be making the puzzles much more difficult but this could scare unexperienced ppl. The good thing is that developers understood this and removed them completely from GoW 2 (at least they told they did).
One more thing is that the battle system is not accurate. There are many options to scum enemies and even bosses so "god" difficult becomes a walk in the park. Is it good? No... If you cant beat the game on "god" - use cheats to unlock bonuses but using scums is not a good option.
The next is bugs. I don't know who were testing this game but it has more bugs then it should. I know that it is not a PC and can't afford any patch but some bugs are annoying. Still they are too rare to get downgrade in the score.
And the last. I believe that level design could be better. No it is awesome, but it could be better. There are amazingly beautiful places but some designs are just a decoration for a battle. I think that developers were afraid to make a perfect game.
Still this game is an art. I love it and replay it often.