If its so far apart that you can't win by recovering 30%+ of your health (50+ with medpack), then you're awful. I get the "I always kill mercs" argument, because I experience the same thing. That being said, 1vs1 on my merc I also always win. That's because the vast majority of people are really bad at PVP and/or gearing.
Did you even read my post? Yes, if you are piloting a Merc and your 1v1 opponent simply stares blankly at you while you cast 3 heals, you probably are going to win. But against any reasonable melee opponent that isn't going to happen. I said it before and I'll say it again - against a reasonable melee opponent, a Merc dps that tries to win the duel by being a healer is just making a bad situation worse.