Klingon continuity is the only thing on here that can get me riled.
Faith of the Heart is... whatever. What Janeway did to Tuvix, I definitely wish didn't happen that way, but I can get over it.
But dammit stop fucking up Klingons, please. TOS gets a pass (and Enterprise, whatever its other problems, retconned a continuity fix for that.) But every Klingon fuckup after that is inexcusable. (Some more inexcusable than others.)
(Sorry. Sorry. I'll go take ten deep slow breaths now.)