I find these discussions quite interesting. I can't comment as I have played no full games (only the first 2 missions in the starter box, although I've followed the game and bought the rule books from first edition) but there does seem to be an awful lot of subjective viewpoint on these questions.
I wonder if the player skill as well as their local meta-game influence the decision.
E.g., I've read a fair bit about how powerful Lilith is, but is she a lower tier because she's weaker, or that her play style is easier to counter by experienced players? Does it matter how she's played? Is she a beatstick or board controller?
Pandora seems to be really frustrating to play against, but does that mean she's better?
Also, I guess crew composition and utilising the schemes better can skew the results greatly.
I'm not really making a point as such! More that Malifaux is so complex and has so many variables, it makes these discussions very difficult.
Having said that, I still love reading/hearing about these things.