I like the idea of a big AOE mark
Which is what I used my, otherwise silly, dragonfear for. The Utility was nice because it works with marking (or the pseudo-marking of the Knight). I wouldn't normally stack them like I did in the example, but it was a pretty extreme fight with lots of moving parts.
SIDE NOTE: one of the real problems I had with playing a Defender is the fact that most of the Defender mechanics were fairly conservative. Like that somehow, the fact you got big HP and AC meant your control elements had to be toned down. But a well-built Controller could lock down the table even more effectively, to where enemies couldn't attack
at all, where a class like the Fighter had to work just to Mark more than one opponent into a Catch-22 situation. The Paladin had better multi-marking, but the penalty for violating their mark was usually a little radiant damage that big monsters didn't seem to care about.
I once played a Seeker (well, to be fair, a hybrid Seeker/Cleric), likely one of the weakest Controllers, and I still had a Daily ability that completely trivialized a big Solo fight beyond anything a Fighter could do.
Heck, my Ranger could reduce a Solo to a prone, slowed, dazed, and stunned mess. Clerics, mind, a Leader class, had an AoE Daze Encounter Power you could get early on. As much as I liked playing Defenders, and miss them a great deal, they had little that could compare to how other classes could do.
Sure, Garthanos, you could exclude all Essentials content from your game, but I'm not sure why you'd want to. It came with some nice Feats as well, rewarding you for using particular weapons, and some better "math fixes" for Non-Armor Defenses.