i apologize for butting in about the whole mega slowbro thing, i mean i love slowbro, so i wont try to attack either side about this harshly, however, i do feel like people just don't understand what makes slowbro so scary. slowbro effectively fills 2 niches for a team,both at different times, that is a regen "shock" absorber, and then a calm mind sweeper(via crobro, psyscald or w.e) basically, crobro could be considered a far far scarier version of suicune, gaining 130>80 spc attack, along with 180>115 defense. at the cost of 25 spc defense and a bit (5?) of hp. of course, crocune is more of a PP staller, meanwhile crobro actually has the spc attack to not HAVE to be scared of not having pressure. another aspect of slowbro that is threatening is the combo of potential burns/shell armor. basically, when slowbro gets set up (late game when it finally decides to stop using regenerator) theres no way to stop it. you lose. even haxing it wont work depending on the set. crobro basically just sits there and boosts meanwhile both physical attacks and special attacks both do jack shit to it. and nothing is stopping crobro from running more spc attack/spc def, since its bulk even uninvested in defense towers over suicunes. with psyscald, basically it plays a bit different then crobro, but generally has the same concept, it sticks around with regen, and fires psystrikes, and scalds, and once the opposition is weakened late game, it megas up and sets up and slacks off any potential damage, unlike crobro, this set doesn't fear chansey or lack of coverage, but however, fears status much more, and requires heal beller's assistance more consistantly vs stall.
however, what makes slowbro scary, is that megabros unmega'd forme acts as its own "wallbreaker" softening/koing pokemon that could potentially take on mega bro with little to no reprocussion, and THEN it mega evolves and sets up. if you don't run a cleric or phaser, bro basically shits on your team if you give it that 1 second of a chance to cripple your counter/checks to it. which is near impossible to avoid seeing how it can easily switch into certain pokemon (like diggersby if it doesn't set up or you get momentum into it, talonflame, most physical walls, etc.) and fire off scalds and heal up with regenerator.
unlike the other banned pokemon, slowbro doesnt have super op coverage, or super powerful hits...but what it does have, is immence bulk, the ability to turn itself into its own wallbreaker, ON TOP of being impossible to break once it gets rolling, which although usually is a shaky arguement, is a viable one for a pokemon capable of being immune to hax, has the ability to cripple checks and counters for itself pre mega with next to 0 reprocussions due to regenerator, and has very viable spc attack alongside insane defense(uninvested mega bro is still bulkier then max def suicune iirc could be wrong), with calm mind, reliable recovery, a powerful attacking move, and scald. i know im talking about normal slowbro a lot, but thats perhaps one of the best reasons to use mega slowbro, that its unmega'd forme is actually VERY useful early-mid game(as it always has been), and its mega is excellent late game. its the perfect match.
deciding wheither its broken or not is none of my concern, since you allready made your decision however that is just how i feel about slowbro and it wont stop me from playing the tier really(that wasn't a jab to w0rd or anything, i was just saying that i like slowbro, so i see no reason for me to get upset over this lel), anyways, i shall enjoy using megabro more in the ladder, just wanted to throw out my 2 cents on the subject. that's all really.