I'm actually sad I just finished it.
From the start Tomb Raider is the most visually impressive 360 I've played to date and are as good as or maybe even better than those of Uncharted. The different locales from jungle to temple to snowy mountaintop are all done beautifully and Lara herself looks amazing. The wind effects and the way the path before you sometimes rips apart is also incredibly well done. I can't wait to see what they can do on next gen!
The amount of depth is also very impressive, as people have already mentioned several areas and collectables are unobtainable early in the game until you upgrade your weapons, i.e. explosive and flame arrows and the ability to pull down heavier rock walls with your bow as well as a shotgun to blast your way through wooden baracades.
I found the story and characters to be adequate but unlike some people I don't play video games for a compelling story, if I want an amazing story then I'll watch a good movie or read a book.
The multiplayer is nothing special and I question why they even include it in games like these. I buy Battlefield for multiplayer not Tomb Raider. I found the length to be good, it took me from launch till now to finish it playing casually, maybe 10-12 hrs total? But I think I would have given this game a 10 if they left out the multiplayer and focused more on the single player campaign, making it a bit longer, I'm sad it's over...............now bring on the next one! lol