If attacking the NXT chain is really so unfathomably easy as is stated by some dudes, then they should just go ahead and make it big. Cash out some millions of NXT and crash the system right after. Because, why not? Nothing's at stake, amirite?
Feel free to come at us...
Honestly, it seems to be nothing more than childish disregard of a promising technology (no offence to XCPers in general, just the FUDdy PoW acolytes)
PoS implementations have a lot of issues and as far as I am given to understand NXT has not solved these in a strong way - if at some point these issues are resolved (by NXT or any other crypto/developer) it would doubtlessly be a very useful achievement. The NXT ipo on the other hand was basically ridiculous and it's limited nature combined with Proof of Stake will probably doom NXT as an alternative currency, which is not to say, ample technological gains/ideas might not come from NXT having existed as a project.
edit: removed gif from quote