How is Osho seen in the Buddhist community?
Is he considered a great leader?


He isn't.


  Does he represents Buddhism?


He doesn't.


  Are his books largely accepted as Buddhist books?


They aren't.



There's really not much more to say.  Why would you even think Osho was considered a great leader by the Buddhist community? He wasn't even a Buddhist. He lived a luxurious lifestyle and wrote in an eclectic, typically New Age-y way, mixing all kinds of influences and traditions that shouldn't be mixed.