Thats because gen 5 is their first flop; regardless of how many newbie fans they've gained. They made better gens than this crap
A flop? This was the firs generation who didn't have any enormous changes to make, and so it's regarded as "bad" because it didn't revolutionize anything. Also, if you mean a commercial flop, attracting new fans is not a commercial flop, especially since that will lead to more revenue, not less. Also, the cliché, cycle-based generation to hate is Gen IV.
Which is more mature: playing a game where you can shoot people or seeing those games and deciding not to play them? Yes, I formerly had a Pokemon Gen VI sig.