"Wait, that didn't work right" - the Dysfunctional Rules Collection

[NNescio]

There are all kinds of idiotic houserules. Critical fumbles are but one type. ^^

Anyway, 'nuther well-known WotC blunder, listed for the sake of completeness:
Martial Adepts' Stance Progression.
A straight Warblade gains access to a 5th-level class feature (level 3 stance) only at level 10. A multiclassed Warblade/X gets it by level 6.

(At least this is easily fixed by delaying the 2nd stance by one level. For Crusaders it's a lot more difficult, their progression is a lot more fouled up.)

On a related note, is there any reason to take Crusader 20? The 'capstone' is pathetic, and the whole messed up stance progression system means no access to 8th-level stances. Which is mind-numbingly stupid, to put it bluntly, since they can't take Immortal Fortitude without multiclassing, despite it being the Crusaders' signature stance.

I mean, aside from the whole "better than Fighter 20" thingy, of course.