When I was living in the north I was near enough an MCC church (in uk) to attend. I went to mass in the morning and MCC service in the afternoon. I loved the people there, the services were prayerful and reverent and the sense of community palpable. I gained enormously from attending and miss them very much. There is no MMC community near me now.
Like you, I did wrestle with the more out and proud gayness and because most people came from the gay scene straight into the MMC community sex was treated way too casually by some but it's important to remember that this is not the MCC theological view per se but just the view of people coming in from that sector.
Another thing that often did worry me was the way in which the people I told (privately and in trust) about my conviction [and the reason why I was working in a garage rather than teaching] seemed to view this as something that might prevent me from ever being fully accepted - although this might have been more perceived than real: I wasn't there very long. . . . . Be very careful who you talk to about this because it's surprising how many proud gays fighting for rights have exactly the same prejudice as everyone else when it comes to BLness.