Kangaskhan is decent for sure, and a serious threat if allowed to set up, and you get lucky with speed (as let's be honest, 100 is pretty average), but by no means leaps and bounds better than anything else.
To be fair, that was pretty much why this entire thread had existed. Everything else(competitive role of megas, the designa of megas, mechanics of mega evolution, individual advantages of megas) can all be handled by other threads(competitive threads, gameplay threads, dex threads etc.). The only unreleased but known Megas are Lati twins, which can be handled by the Legendary thread.
Really, this thread is kind of redundant at this point.
Alright, since the games have been out for a while and we know all the Mega Pokemon, there's really not a whole lot more to discuss on this front. From now on all Mega Pokemon related discussion will go in the General Gameplay & Battle Mechanics Thread. This is only for the discussion of known Mega Pokemon. Posts such as "I want x Mega Pokemon" or "I think x should get a Mega" have no place. If you have questions regarding Mega Pokemon use the Official X & Y Help Thread.