Speed of HDs is very important if those are like 5400rpm they're junk. Also they should be raided most likely... and yeah 2GB ram is really low... I run 8GB on my PC and 16GB on my mac :P
It's not bad though and certainly better than the vast majority of computers I see sitting around at non computer peoples houses :P
If was a main machine to be used by a designer, gamer, or developer I'd give it a 5... If I were judging this based on just a computer at some random persons house I'd give it an 8
Extra credit: I've got a computer bone yard over here... enough parts to build two or three machines at least... However you COULD downsize the case and hook it up to your TV. Get a wireless mouse and keyboard and stash them in your coffee table. Use it to stream / browse / whatever to deliver media to your TV