It is still incredibly viable to play nidzilla.
Meh, I don't agree. The reason that Nidzilla worked, was because there were some very useful VERY cheap Fex builds that you could spam, and then there were also some pretty cheap Tyrant builds as well.
Those are all gone. You can't field a 115 point Fex anymore, at all. And what you can field is a lot less value for the points, so it's not just a matter of taking more expensive
MCs, they're just not the ridiculously undercosted obviousness they were before.
Not to say
MCs are all bad... Tervigons are great, T-Fexes seem to be popular in power builds so far, but they've put a lot of the value into the littler guys. Gants, Hormagaunts, Gargoyles and Warriors are all good for the points now, Zoanthropes and Hive Guard are also very nice for their points.