I personally dislike Roxas. I don't like his character, thought he was pointless, he's just a fake, so there's no real need for him any more. He played his part, I'm glad it's over, and I'm glad to be playing as Sora again
Roxas can only weild 2 'Keyblades', because his 'Keyblades' aren't real. They're merely a fabrication of the Sora's Memories, due to Roxas' connection with him. They're not real, just copies =P