i cant compare it to TL2, as i havnt played TL2...
but from what that article says, TL2 has many of the same problems of TL1 - so it'll probably get dull just as fast. D3 otoh seems to have eliminated a lot of the problems of D2, in the name of making it more fun to play.
but apparently, i'm a carebear casual type, because i dont see the 'fun' in having your character turn out to be shit at high levels, because you didnt realise you shouldn't spend most of your skill points until you hit 30... apparently mechanics like that were what made D2 awesome... at least, according to some folks on the d3 forums they are. but as someone who likes my games to actually be fun and intuitive to play (rather than having to research the best way to do it before you create a character), D3 seems pretty good to me.
maybe TL2 will be good too, who knows. i like that they've got multiplayer (you know, like they said TL1 would get in a post-release patch...), but the fact that they havnt completely rethought the gear and skill systems worries me a bit.