xattuu keeps putting his foot in his mouth on the forums, which seems to be hurting his reputation, but he actually is a very nice guy and clearly has potential as medic. I don't think anyone who has been on a team with him would characterize him as a rager or anything.
his biggest problem, from my experience, is his level of dedication and mindset. it felt like, on the spectrum of players from those who treat scrims exactly like matches to those who treat them like pugs, xattuu fell way too far towards the latter side of the spectrum. he would purposefully go for crazy medic frags at bad times, not to mention go afk or spend the entire rollout to mid talking about stupid shit. in matches, to his credit, he did try a lot harder, and some of the time this resulted in confident and strong play with good communication. however, when there wasn't a lot of time to prepare or he missed a lot of scrims due to irl busyness, it felt like he was rarely prepared enough to play a map in matches, because he didn't maximize the effectiveness of the scrim time he did have. if he realized just how important scrims are in getting everyone on the same page, learning your role in every mid fight, learning the way your pocket and demo and the rest of your team want to play a given fight, etc., he would instantly be competitive at at least a low-mid IM level. it's tough to instantly recommend him based on what I saw last season; however, at the same time, his problem seems to be a very easy one to fix if he just acknowledges the extent of it, and therefore gambling on him for your IM team might be worth it because I could easily see him turning over a new leaf in that regard.
I hope I've been fair and even-handed in this post.