MMs usually kill scrappers especially those that have that scrapper attitude. Ur Merc/Traps might be a decent disruption type toon, but will have a hard time getting kills solo. The Thugs/Posion is a very good build as an MM, but takes a bit of skill and experience to do well.
http://boards.cityofheroes.com/showthread.php?t=139481
Hope that helps.
I really dig the MM class and I'd like to do some PvP with them. I hear the last few Issues really did a number on PvP, so i was hoping I could get a lay of the land here before I run out and get crushed. I have a thug/poison who I used to do well with and a new merc/trap. Are any MM builds viable in PvP? Or, are they all scrapper bait?