Not at all. It was just difficult to find the same kind of satisfaction in your work when other parts of the product fail so spectacularly. The MobileMe launch was a widely known failure, and the effects of that (and the problems) went on for a long time. Still today, there are many (legitimate) complaints about MobileMe, and such things impact one's satisfaction quite a lot.
Well job satisfaction with a department really depends on if you're actually doing the work requested and the terms on which you left (or were terminated, right?) Not that I had a love affair with MMe at the end of my job, but that had to do with the policies that Apple employs in terms of mass communication of pre-release products, and not with the level of talent in the existing team.
Oh for sure, the teams I worked with at MMe were all super talented and fun, and I still miss them. The problems were largely with the infrastructure and lack of vision for (or understanding of, perhaps) the product itself. Mostly details I can’t go into, of course, but it was nothing to do with the level of talent in the teams.