Playing around CB Scyther is like playing around SD Absol. Sure Absol has absolutely scary damage potential (being able to ko techtop after residual damage with sucker punch = wtf) but it's not that hard to beat if you predict around. Same with Scyther. If it comes in on Toxicroak, I'm staying in, eating the 4x U-Turn, and hitting whatever comes in hard. And if I think it'll attack the next time, I always have Rhyperior. It's even better when they lock themselves into Quick Attack to avoid Sucker Punch or revenge Sceptile or something, because then I go to Spiritomb and lolpursuit.
In general I am just very unimpressed by Pokemon like Scyther, Swellow, and Moltres. Maybe it's my playstyle, but I just hate Pokemon that are like "it has one big weakness but if you play around it, it can be really good". I couldn't even use Yanmega properly the last time it was down here (although obviously I agreed that it was broken). The Pokemon I like best are Pokemon like Arcanine, Venusaur, and Rotom, who can consistently pull off multiple sets easily and still function fairly well if their ideal conditions are not met. One-dimensional Pokemon like Scyther and Swellow almost never find a spot on my team and almost never sweep me anymore unless my game is off.
I don't think there's much to discuss with regards to Venusaur and Milotic. I've never thought Venusaur was broken and I haven't seen anything to convince me otherwise. Sleep is always annoying, but I imagine those fuckers up in OU who have to deal with Breloom have it way worse than us. Still a bit on the fence about Milotic, mostly because I've mostly been gimmicking around lately and if there's something Milotic is damn good at, it's walling random shit from NU. Still don't think it's broken, but sometimes I think even if Lugia dropped down to UU I'd just run Houndoom and CB Rhyperior on every team and tell people to stop bitching, so my opinion probably isn't the best to go by there. I just have a hard time figuring any defensive Pokemon to be "broken", because whenever you get stalled out it doesn't sting nearly as much as getting swept, and it's definitely not as obvious.