RMD / RMP as combat is much weaker than as subtlety. You can't stay offensive enough to stack your insight correctly and nothing happens. Best partners are hunter, enhancement or elemental. Enha popping swifty to 8 sec kidney with tricks and killing spree is beautiful. Hpriest is by far the best healer to go with in 3s.
i have some friends playing Boomkin+Combat+Rsham, they're at 2660 at the moment, it seems pretty good (everyone in stealth and a big burst coming really fast whenever the boomer has starsurge procs)