I'd rather have an Empath on my team but only if they play as a buffer, keeping Fort up on as many people as possible all the time, casting RAs on cooldown when the team is grouped up without calling for gather. Putting Clear Mind on people who are likely to need it. Most people seem not to play them like that, which might be part of the problem. If you play as a Healer and not a buffer then yes, you are going to underperform.
Interestingly, there are Bad healers in other games too. In WoW bad healers spam their lowest level heals, don't use cooldowns or use them at the wrong time. In FFXIV bad healers only heal instead of attacking. Small wonder there are bad healers in CoH too.