They're cute, but I find them a little plain(?), I'd have to let them grow on me. However, it's ironic because I've been wishing for a water lizard starter for ages, but I'm a little underwhelmed on Sobble. Hopefully he'll grow on me as well. Currently I like Scorbunny the most, but I'm seriously hoping he won't be another Fighting starter. I sorta want it to end up as Fire/Fairy (I seriously doubt it though). Grookey is okay, nothing eye-catching to me though.
Also I've noticed that no one has suggested Electric for Scorbunny's final evolution? I see it as the most likely along with Fighting, or perhaps even Ground. For Grookey, I was thinking Rock or Dark (its apparently "mischievous"). For Sobble, Psychic or Ghost would be probable (or Poison I suppose), mostly as I've taken into account the fact that it has the ability to turn invisible. Maybe even Dragon, but I don't know if we'll ever see that for a starter (unless it is a Mega Evolution, hence Mega Sceptile and Mega Charizard X).