don't do it!then through IW
take it from someone who LOVED Deus Ex.
Invisible War is not even worth it. the story is ridiculous, unsatisfying, and far too simple. the characters are forgettable. believe it or not, the graphics even look worse thanks to some horrendous character models and texture work. they botched the user interface and itemization system as well. about the only thing they did right were NPC animations and slightly improved voice acting.
on the whole, the IW experience was thoroughly un-enjoyable.
maybe standing alone it would be good enough for the bargain bin. but it's supposed to follow DE, which makes it a stellar failure.
you'll probably do it anyway...
the only reason I got through it was out of morbid curiosity