Honestly, I kinda don't mind the current setup.
I kinda have mixed feelings about it when I win as Antagonist. With the way it is currently, I go into it expecting to lose. Sure, I try to win but it's not going to happen except against the most disorganized groups. (In some ways, the broken scoring system works to my advantage as the people who go out of their way to rack up grunt kills are usually the most vulnerable.) This way, I can have fun without worrying that I'm going to ruin someone else's game.
There is one more advantage. Playing antagonist is a guaranteed way to lower your MMR. Given how off-balance it currently is, you're going to lose often while playing antagonist. As such, playing Antagonist keeps my MMR low which keeps my raider games at a comfortable level of difficulty. This is kinda important as the raider games are where I get the majority of my monthly score. My MMR pretty much fluctuates between 26 and 31% with the wins coming from Raider and the losses coming from Antag. (Sometimes I win on antag but those rare wins are balanced out by the rare losses on raider.)
Overall, yes, it'd be nice to have a chance at more antag wins but the way it is now has enough advantages that I don't really mind.