My take on the disliking is the repetition, there's only so many times you can "Catch 'em all!" and beat all the gyms, defeat the elite four, the battle tower or any other system which is basically "You beat me, another, stronger guy takes my place until we run out of guys."
It's a formula that's remained entirely unchanged, even with the addition of doubles battles, which is still just as repetative.
Don't get me wrong, I like Pokémon, as a concept and the original games were some of the greatest, although I don't overlook actual gameplay progression, but seriously, how many versions of the same game can they possibly put in front of us before we start to realise it?
I mean hell, they're even releasing re-makes of better, older ones. Which is worth getting for the sake of graphic improvement upon a classier game.
As for searing hatred, that shit is just not understandable in the least.