Wow. A Harry Potter MMO. Now that would be milking the license for all its worth. I wonder where the hat would put me? Probably have to answer a bunch of stupid moral questions first. Or, have several small moral-based missions prior to the sorting, and have the hat base its desicion upon that. But now I'm going off topic.
The fanbase is usually the whiniest bunch; get that right, and the rest of the pack will quickly fall into place, queue money. I must admit, I haven't been following the success of STO very closely, but from the sound of it, the hardcore fans appear to be satisfied. I mean, I haven't picked up any news articles about Trekkie boycotts lately, so I'll assume that the missions are interesting and passive enough to adhere as closely to the source material as possible. I for one prefer to see more adventurin' in my MMO's, so perhaps I should give STO a look, if that's the direction in which they chose to head.