Been in the A's for a while and there's at least one Dynamo every few games for me. Curse the games where there happens to be more than one on a team. I don't usually stick around after the games been had, though. I like to back out and look for a new lobby. If you happen to do that too... Well, then! I think the only thing left to do is trade locations because I'd rather not play with them anymore. Aha.
I agree with that there's a Dynamo at least in every few games, but that's far rarer than something like the .96 gal (which clearly needs a nerf /s).
I edited to add this part: The best weapon concept doesn't and will never exist, but the best composition of 4 weapons will probably surface.
The weapon I choose will depend on the team I'm facing. If a meta develops and you start seeing teams using the same formula, then you know so you can tailor a strategy against that particular setup beforehand because the likelihood of facing it is very high. However in random matchmaking, you can potentially face any combination of weapons. It's a huge difference.
What you're saying sounds more like a MOBA thing where every character plays quite differently. I personally think that there will be role compositions in teams but never defined weapons because a couple of them could adequately fill the same role. Best weapon concept is certainly possible given how many complaints there has been against the Dynamo Rollers. I'd figure I'd see more people use them since it sounds like the secret is out.