Exaggerations aside, Busi's biggest problem is his inconsistency. But, as it has been explained for countless of times now, it WILL come with age. The kid's 21 and playing already both for our first team and La Furia Roja's senior team.
I think Busquets has plenty to offer, he just needs to mature a bit and gain some experience. Or have some of you forgot that his game against ManU last season, which was one of the most (if not the most) important games of the season. He has all the necessary ingredients to become a solid DM, he just needs time.
Besides, he started as a good cover for DM position, as it was certainly needed then.