I'd truly stay away from Allen...what the dude does with his legs on defense are not basketball plays. He'll be out of the league in a year or two.
Plenty of guys do plenty of things that are not basketball plays. Smart has. Wade has. Simmons just did in the game today. Marcus Morris gets into multiple dust-ups every year. Cousins is constantly throwing elbows. Draymond Green plays with an edge that verges on dirty non-basketball plays. Isaiah Thomas just whacked Wiggins in the head.
I'm not saying he's not dirty. I'm just saying I think the "tripping" thing is a bit overexaggerrated. None of his trips were dangerous to the opposing basketball player. They were unsportsmanlike, but not dangerous. I think hard fouls in the air or tomahawking a guys arm on a drive is more dangerous than any dirty play Allen has made.
At that point, you just have to examine his work ethic, team attitude, and ability to impact the game. I really like his three-point shooting and I think his driving will be even better with a spread out court in the NBA. He plays for a winning team, and he helps his team win games. He has one of the best euro-steps in college basketball and has the ability to finish explosively at the rim.
He will end up being a good player if he gets drafted by a good coach like Pop, Carlisle, Spo, or CBS. In the right system, he could be an Evan Fournier, which is great value late in the first round.