Gamespot has a review of PC version of Full Spectrum Warrior online today.

You also can't enter buildings in the game (except in a few specific cases where your mission path takes you through one), even though you'll always be surrounded by them and you will come across enemies firing at you from windows and balconies. It's not that there are clear-cut ways in which features like this could have been integrated into the game; it's just that the game shows you things that it seems like the game should let you do on your own. Since a lack of variety is one of the most notable shortcomings of Full Spectrum Warrior, these types of things stick out as omissions.

Not my thing, this sort of game is perhaps best suited to a console, and we weren't all that keen on the XBox version anyway. But don't take ours or anyone elses word for it, try the demo and make up your own mind.