Gee thanks, medkits are really WAY too powerful, especially for classes that can't heal. I mean, a healing class can spam another heal about every 2 to 3 seconds, but the dumb tanks using a medkit every 90 seconds is indeed very unbalancing. Maybe, for balance reasons, tanks shouldn't be able to use any healing items at all, I am sure that would make things even better!
Also, let me applaud the intelligent game design in regards to the above: good idea to give classes that can heal healer pets early on or even right away, and let classes that can't heal wait for level 30 or in some cases, 40 until they get that. That should show them. Well done! How was such brilliance achieved, did you flip a coin? Roll some dice?