Erati, I think you have never played an enchanter.
First, starting at about the Master level as an Enchanter it's possible to just get fucked by the RNG. If you get a lull crit in HS South, it's probably time to cap - 3 HTs = 1500 damage and then you'll get chain bashed anyway. It's easy to get 2-3 charm breaks in one minute when you are charming 50+ mobs, and when you are charming a L50+ pet against a L55+ mob, a charm break = 1k damage or more. When you get to the GM level things get really dicey (well except the fire giants who were way easier than I thought they were). When you kill stuff in HS east you are charming 52+ mobs who don't like to stay charmed.
edit; my point here is that a) its not as easy as it looks from the screenshots, and b) no matter how good you are, you can lose
Second, as Svenn has proved the best class for this challenge is Shaman with strings. I should just not let that bastard recharge
[You must be logged in to view images. Log in or Register.] A shaman with strings has all of the enchanter abilities except lull/mez and they also have 50% more hp/ac and the ability to heal themselves.
Third, everyone makes allowances for your class/level. We were all pretty impressed by Ploktor and Sanluen doing disciple level mobs on bards and druids. And in fact if you can solo the froglok king at L50 that is pretty good in my opinion.
Fourth, I am pretty sure that Necros, Mages, and clerics (with strings) could manage GM mode if they were so inclined. I'm slowly putzing around with Triassic; his two goals are to train a 100+ population Trakanon poopsock and work on the solo artist challenge if he gets high enough.