I've only built one I'd consider notably egregious:
Sisay, Weatherlight Captain. I'd wanted to build a Honden deck for an age before Sisay existed, so I jumped on it when she was spoiled; it's also a good home for a few orphaned legendaries. The repeatable card advantage from Sisay becomes explosive in combination with
Jegantha, the Wellspring and
Derevi, Empyrial Tactician; in this combination I'd rank her in that problematic tier. Despite that, Shrines is a relatively weak win condition for Sisay, so I'll keep playing the deck. Also because I still haven't managed to get all 11 Shrines out at once, despite activating Sisay 13 times in a single turn
![Mad :mad:](./images/smilies/13-mad-fb.png)
(One always gets wheeled away or exiled before I can get them all).
While I do have a
Derevi, Empyrial Tactician deck and a
Kess, Dissident Mage deck, I'd rank these commanders as powerful but not problematic, largely because they're less able to completely carry a deck by virtue of the commander alone. (Derevi can to a degree in stax builds, which mine is not).
Overall though, I find the problematic commanders to be uninspiring and (most) decks helmed by them to be uninspired; in a format with self-expression as a major draw, these commanders tend to work against that. They also tend to be antithetical to a relaxed atmosphere which, while a relaxed game isn't always the goal, is certainly something that needs to be considered before bringing these commanders out.