I don't hate his presence in the show at all, I just don't think he's really a good dude.
Will be interesting to see how many more people he tells origin stories to. Will they all be different and play to the vanities of the person he is speaking to (a la Heath Ledger's Joker telling people differing stories about how he got his face scars)?
He's a manipulative little dude. He certainly knew that Tommen was going to blab to his mom, and for as much as he preaches against sin, I am not sure that complete honesty is his strong suit.