I can’t really say it’s an opinion that he’s bad though. If you want to kill people you choose Fragger, Nader, maybe Vas. If you want recon you choose Vas and possibly Redeye (I haven’t tried him since his buffs hit). Both outclass Phantom in every single way.
MM is pretty much a pub anyway right now, there’s no proper established meta game in it and it’s completely different to actual competitive with rulesets and the like. I don’t think we’ve seen Phantom used once in an actual competitive game outside of when that one team picked him and got absolutely destroyed on Bridge. And while competitive players will always choose the best choice, Phantom is never that, ever, and that’s why he honestly needs something more if we’re balancing for the higher end of players and not pubs.