knight x1868
Blue Lantern Corps
You have a lot of options that allow you to charge your trait safely. His trait is really nothing more than Killer Frost's or Sinestro's trait and both of them were very capable characters.His trait is the only thing that keeps him relevant. Any CC worth their salt is going to be charging it as often as possible.
Problem is probably over half the cast has ways to punish him for trying to charge it and the only way he can safely charge it is off of a combo. With his footsie tools being pretty poor he has to be really on point to get any combos going.
He's a whole lot of work for very little payoff. When played perfectly (perfect management of trait, good use of footsies etc.) he's probably still only mid to low mid tier. His trait shenanigans aren't nearly as scary unless they are in the corner (pushblock negates a lot of the pressure elsewhere).
Edit: I misread your post. Charging to lvl 2 is often hard enough, going to lvl 3 is way too hard. Plus you risk wasting all that time on getting the trait blocked. At least with lvl 2 you can get it out off of simple combos and strings. Lvl 3 just isn't worth it.