Completely wrong. Warden is extremely powerful due to its invasiveness. It scans your RAM in the location in which WoW is running. By detecting differences in the way the memory is behing manipulated, they identify cases where third-party programs are modifying the game.
You seem to be venting about the rampant hacks in Diablo 2, and I fully sympathize with you on that point. However, your conclusion that Warden is therefore weak is a poorly-informed one. You do know that Warden is only installed on World of Warcraft and is NOT present in Diablo 2, right?
Hey, look @ me! I read a wiki article and I know what I'm talking about! teehee
Nope. "Completely wrong."
"(...) but the game can basically be considered unhackable. The code is very sound. So as a word to the wise to all you hackers out there, don't waste your time trying to hack Diablo II." -Blizz, 2000