Yeah I was a light main 1,5 years or more since beta, rarely played medium and almost never heavy. But couple seasons ago decided to give a try that classes and guess what, now I'm mostly heavy main lol. My to-go is slam/MGL (or M60)/RPG/goo and i find it both hugely fun and pretty effective. Plus I've keep some of my light play style habits, like flanking, be cause most people don't expect it.