<pinches the bridge of his nose>
Let's me quote the relevant part of what I originally quoted.
Having Baby Groot ridiculously beat up guys isn't the same thing. Its just lame hijinks, like having him be too stupid to know which button to push. Its just stupid, and in a movie where Ego the Living Planet isn't actually a planet and has a human kid, this movie is pretty much already filled with its quota of acceptable/forgivable stupidity. Its junk like Baby Groot that takes a movie like GOTG 2 from enjoyably goofy to annoyingly idiotic.
@kirk55555 There is a clear sequence where Baby Groot f***s up a baddy with his extending arms. He's still very, VERY capable of kicking some ass.
And besides, if he had been normal Groot straight away, that would take everything out of his sacrifice. "Oh, he can just regenerate within a few days? Big deal then....." He might not have known he could re-grow. So yeah, him still being a baby makes more sense.
It really doesn't. If GOTG moves like every other Marvel movie, its been at least a year since the events of the first movie, possibly more. I'd give Groot a month to regenerate to full form, but I bet he's had at least a full year. He's baby Groot for the same reason teddy bears helped defeat the Empire, it sells toys and makes 4 year olds happy (and I say that as someone who doesn't really dislike the Ewoks). I guess at this point I should just happy he's not going "Mesa Baby Groot"

In the end, I know comic Groot regenerates pretty quickly, but Gunn pretty obviously hates the comics so that doesn't matter. But, even ignoring that, it makes no sense for Groot to not be regrown by now. The "sacrifice" moment was them thinking Groot was dead. Since he didn't die, he doesn't need to stay a baby until Gunn stops making GOTG movies just to show "consequences", especially since that's obviously not why he's still Baby Groot anyway.
I'm still interested in the movie. Its gone down my list of movies I want to see next year, but I love the MCU. I even like movies like Iron Man 2 and Thor 2 a good deal, so even if it looks like GotG will be about the same quality as IM2 or Thor: TDW (if not a bit lower), I'll still like it well enough. Although I hope Gunn moves on after this, I'd definitely like to see a Marvel space movie made by someone who likes the Marvel cosmic characters (not just GotG, but people like Nova, Moondragon, etc) a lot more then Gunn does.