will intel gma 4500hd perform well on less demanding games like world of warcraft
World of Warcraft will run fine on the Intel IGP.
You might have to run the program at lower settings, abet with a little lagg.
I play Dungeons and Dragons Online on my AMD 690G IGP and the game runs fine, just a little slow.
It's ok for RPG games like World of Warcraft and older fps games like Counterstrike. Just don't attempt to run newer fps games. They won't work. http://www.tomshardware.com/forum/251808-33-intel-game-compatibility-list
^ That is a games list to give you an idea of the types of games you can play, keep in mind your IGP is more powerful than the one mentioned.