X-Men movies being seen as underwhelming Wolverine-solo films
Well, Wolverine really DID get focused on too much in the X-men movies. Those really suffered a bit because of that. Calling them "Wolverine and the X-men" movies would be accurate.
What they should have done is just make some movies focused on the original core X-Men first (Scott, Jean, Hank, Bobby Warren Professor Xavier) and just do that; Wolverine could come later. But the problem was (and is) that most of the fanboys expect Wolverine all of the time, so Fox and Marvel catered to them.