Then again, literary criticism really isn't my strong suit. The only sequel novel I ended up disliking to the point of not reading any further was the sequel to Eragon. If the writing style really dropped that much, I can't argue until I've read it. I just want to know more about Bean.
On-topic: Bean had more guts/nerve than Ender as a child. Ender awkwardly lashed out at people who treated him badly; Bean took control and even tried to muscle Ender into giving him more respect.