On Rowlet, I mean we extrapolated that he would be slow and bulky from the pre release footage, but I still burst out laughing when I saw his base stats (Rowlet had a neutral nature according to the leaker)
Whilst Grass/Ghost is an interesting attacking typing, defenses wise it's barely any better than Grass/Flying. To stand a chance as a Grass/Ghost in the meta you need to be speedy and able to take out Pokemon quickly, because being a slow Grass/Ghost Pokemon is suicide in a meta where everyone and their mother is running around spamming Knock Off, Ice Beam and Fire Blast/Flamethrower, Trevanant and co can attest to that.
As it stands it looks like the Rowlet line will be joining it's fellow Grass/Ghost mons down in the lower teirs.