Phantom and Lord, you weirdos.
Ents take too long to get to the point, eh? Did it ever occur to you that Ents live far longer than you do? 'Hasty' and 'Takes too long' are both relative descriptions. Considering how sweet and wonderful Treebeard was to Merry and Pippin even though they were on the opposite end of the scale, I think it's downright nasty and despicable to hate the poor Ent based on that.
He could just as easily hate you for being unlike him but he's not like that. He's nice.
As for not doing anything of value, was it not Johnny T. himself who said that it would be better if more of us valued the simple things in life. Just because Treebeard wasn't always going around picking fights in some foreign land you want to kick him out? He just wanted to take it easy!
Plus, with the exception of Sauron, Treebeard could defeat anyone in that list in a fight – including your precious Elrond and Isildur.
Treebeard is awesome. Case closed.