It's been said before by at least one Red, that introducing new game mechanics is incredibly hard and I don't doubt it. Putting Stealth into this game must have been really difficult, Nidalees abilities were probably hard as well given her duality.

It's weird, I personally thought trundle would be incredibly boring and monotone to play and just bought him for the lulz; played a few games now and well...he's awesome. His mechanics may not be very original (except the ult ofc) but the combination makes his playstyle weirdly unique and interesting...

just my humble opinion tho