WildHealer
Mongoose
When I look at the RQ core rulebook I see "Open BRPalike System Core Rulebook", more than I see the word "RuneQuest", and I think if people thought of it like that it might go down a lot better amongst long-term players.
With the caveat about the dodgy rules which have already been identified (Halving, crits, char rolls, etc) & which have clearly caused great irritation, I'd agree wholeheartedly there. However, given the fact that Mongoose clearly wanted the association with previous editions of RQ (& by association Glorantha) rather than the "Open BRP-a-like" tag, it might have posed fewer probs to have a simultaneous release of a generic core rules book (inc companion), plus a Gloranthan core rules book (ie magic, monsters, cults, etc). Certainly RQ3 got some way round this with by covering spirit magic & divine magic in the core rules and providing an Introduction to Glorantha book.
As has been said on these boards before, if you call it "RuneQuest", people will judge it as such - Mongoose have opted for a bar set very high indeed!