1 - you don't have to choose this specialization
2 - its preferred (IMHO) to mages, in general, being broken like DA 1 and 2
I am just glad mages didn't continue to be way over-powered as in previous titles. DA:O was so 'un-fun' with mage AOE spells, I didn't use them when I played through. It was way to powerful. Same with DA2...
The KE IS overpowered, for sure. Kind of cool to use at lower levels for battles above your level, for those that don't want to combat grind as much or quick game run-throughs. If this was an MMO, it would be nerfed pretty quick. Since this is a SP game, I really hope they don't neuter it.
Mage damage spells seemed way under powered in all of them, at least at Nightmare difficulty. But they did have some really OP specialized spells, like the one that destroys other mages that have mana. There were also combos in DA1 that was very powerful and were mage combos. In DA1, the arcane mage was also way OP in damage taking ability in the late teens and on. I'll agree that mages were OP in DA1, but not for their damage. At least at Nightmare difficulty, all damage spells damaged your party too.
DA2 on the other hand, the mages ability to do damage was laughable, and didn't even have great crowd control until late, but were important for healing. One spec did have good crowd control, and was pretty good for that, but rogues and warriors did more damage. The real power of DA2 was combos, and every class had great combos, the rogues being by far the most damaging, and with a shield bashing warrior to set it up, was very reliable damage.
In this one, the Knight Enchanter in this one is definitely a tank and OP. A lot like the arcane warrior of DA1, without as much crowd control. I rerolled to rogue because it was too boring, in part to being indestructible. The rest of the spec's are not OP at all.