Interesting story, and I'll tell you why (I think so). I'm a part-time FI in the U.K. and I'm the only instructor who teaches multi at my school. However, I did my basic multi training (PPL initial, not instructor which I did in the U.K.) at St. Petersburg, FL.
Now, your flight test sounds pretty tough to me, and you should be pleased that you coped so well, but this ties up with my own experience in the U.S.
When I was doing the multi course there it just had to be done perfectly or we did it again (perhaps the instructor was just knocking up multi hours - I don't know). Everything had to be just exactly spot on. Come the test, the oral seemed to go on forever, way past solely multi-engine issues (perhaps the examiner didn't trust a Brit!). The flight test was one of the most rigorous I have ever experienced. I was solely resonsible for R/T and navigation (in and out of CAS). We started late afternoon and went into the night! I don't think multi-engine ratings of any sort are given away in the States, despite what you sometimes hear. Well done, and enjoy it.
Regards, GT.