I actually like the new "Nu-Metal", especially when it's mixed with Tech Metal like Hacktivist. The MC's have far more skill than Fred Durst ever did. I think the problem with the first lot of Nu-Metal is that the rappers were truly the most horrific specimens to come out of any rap-related scene. It seems that these days the heavier spectrum of music is actually attracting some MC's with skill, rather than a bunch of wannabe's and honkey krackas completely bar-stewardising a type of vocal that, actually, requires a lot of linguistic dexterity.
I am by no means a fan of Hip-Hop or rap, but I can always tell that there is a lot of talent there and I wouldn't attempt it in a million years, not even in jest. As much as I hate Eminem's music, for example, I admire his ability to spit out all those syllables in a way that I can still understand what he's saying in such a small space of time.
As for mixing it with Tech Metal, well, as long as they are choosing a GOOD set of musicians to pair up with, there's no reason this shouldn't work. I think Hacktivist are going to be leading the way in this resurgence and, more importantly, improvement in the progression of Nu-Metal into pastures new.