I haven't partied with a mage that uses life tap continously for ages, but let me tell you, I certainly did not miss the experience.
Today in MD KQ, I had partied a mage who continously used it. At first, I (and possibly the second awesome cleric in my party) kept getting heart attacks when his life suddenly went down. Then we started to realise he kept life tapping. I soon decided to stop healing him straight away. I would take my time to heal him, though the second cleric was still nice and kept healing him.
Towards the end though, both of us were reluctant to heal him to the point where he life tapped until he had only about 100-200 HP left, where both my cleric and I were pushed to heal him.
However, none of us said anything throughout the whole KQ. The cleric and I didn't ask him to stop, but he didn't whine about us taking our time to heal either. He wasn't a crappy mage or anything, he
was doing his bit in terms of damages.
BUT GAH! Stop with the life tap! Why do we clerics have to use up all our sp stones just so you can get
your SP back without stoning! We use our SP stones to heal you so you can save your HP stones, so use your SP stones to get your own SP!!!!


I refrained from saying anything because I didn't feel like starting up an argument and things.. but mehh! I thought Life Tap shouldn't be "abused" (to put it dramatically) for your own selfish needs in the expense of others... =.="