I'd think the best rule of thumb would be to just avoid using things which you know are broken -- not overpowered, but actually broken. Like if Cryptic says an ability is broken. It happens occasionally, and often problems remain unfixed for months or more.
I gave up worrying about it when a whole slew of posts began, "I don't use any consoles, except for x and y." It turns out that no one is using any consoles, while actually using their two favorites.
STO Forum member since before February 2010.
STO Academy's excellent skill planner here: Link
I actually avoid success entirely. It doesn't get me what I want, and the consequences for failure are slim. -- markhawman