I've been (very) high (on multiple things) playing League and can effectively argue that being bad comes part and parcel with a lot of things, but is generally exclusive from inebriation. Being inebriated in any way will increase likelihood of screwups and being outplayed, but it won't magically make you bad-- you know, such as the difference between missing a skillshot and picking a champ with bad poke and no stuns against Camille.
Camille is overtuned and a bit overloaded but needs a small numbers tweak to enjoy relative balance.
People crying she's OP probably have not played 122 matchups against Camille. I imagine Quinn could be a decent start, as might any champion like Nautilus who can more readily determine the engagements. However, most arguments are about the same three points (her shield, true damage and ult) so it's very likely that these people are playing or maining matchups that suffer from those in particular.
That being said, the average League player still needs help with what Grievous Wounds is. The bar is set phenomenally low, probably because a bulk of players sit in lower-rank levels of play; I don't play ranked and don't care to, but my supposition is that most players probably class about high bronze to low silver in terms of how well they actually play.
That repost says it best. It's one thing to make a good play; it's another factor entirely that your teammates have to show up for it. But I digress.
Ivern got the same treatment and now everyone says he's crap. They couldn't believe it, before release people were up in arms about his root and his shield being in the same kit. Might as well have been high treason.
They'll come down off it once her mana costs get nerfed to appropriate levels.