I agree, Limbo is a great game, if you play through it in one setting with the sound turned up and the lights dimmed down, you can really get drawn into its simple atmosphere and sound...But that really begs the question, just what does the little boy and his sister represent? As for Tony Hawk...shame on you, Project 8 D: THPS3 is in my opinion the greatest and best in terms of soundtrack, skaters, levels and (please forgive me) graphics and realism. After it, the series went very quickly downhill apart from THUG.
I loved Project 8. I've played all of them but Proving Ground and THUG 2, THPS3 is my favorite by far, though. I played that so much to unlock all the stuff that I can still do a lot of the levels to 100% completion in one run. Also, Wolverine and Darth Maul.
I actually liked American Wasteland. It had too much Green Day and the visual style as a whole was a step in the wrong direction, but starting that skate park from scratch and the no-loading open-world skating was brilliant, I though. I was always excited when I got cool pieces to put in my skate park.