The problem with the Bray Wyatt character(s) is that they (except the fiend, ironically) made little to no sense in the context of a wrestling TV show (and bear in mind this is a setting in which we've had an undead wizard dominating for about twenty years).
The Wyatt family version of Bray Wyatt, and the Firefly Fun House version, would have been creepy and weird in some other TV drama/work of fiction, but in the world of wrestling I just found myself thinking "what exactly is the point of any of this?". They are prime examples of gimmicks that are actually too gimmicky for wrestling. If either of these two versions of Bray Wyatt had been used as a character in some crime drama, whereby they were serial killers or something, that would work. The problem is when you try and get this **** into the wrestling world (especially in PG era WWE), the most sinister thing these supposedly creepy characters can do is go out to the ring and have a wrestling match with someone. This is literally the only way which conflict and tribulations can ever be resolved. As a result, gimmicks which try to portray people as being genuinely ****ing unstable and eviI to the point they are cutting promos that imply they are going to basically murder someone or something are just dumb. Why on earth would these people be interested in wrestling at all?
It's the age old ****ing problem of supposedly heinous, wicked, deranged people deciding that the best way to resolve an issue/carry out their evil plan is to get in a wrestling ring and lie down on someone for 3 seconds. I mean come on. And like I say, this is a profession where you can get away with having an undead wizard and his pyromaniac monster brother, and have this seem plausible. And I knowwww this is just how wrestling is, but ergh, there are "out there" gimmicks, and then there is 3rd wall breaking shite like Sting teaming up with RoboCop.
It's like when Chris Jericho made one of his WWE returns (the second or third one I think), where there were all those vignettes about how he was going to "destroy the world", and then what we actually got was Chris Jericho wearing a jacket with Christmas lights on it. There are exceptions to this, but if you can't at least tenuously (and this can be very tenously indeed) ground a wrestling gimmick in the context of...er... wrestling, chances are it'll be absolutely shithouse.