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A couple years ago, my mom bought me a Bleach fansub, and the subbing is really bad. Bad grammar, bad spelling, bad translating, you name it! I still like it a lot though, if only to laugh at the failsubs.
I don't know what subs you watched. Mine were decent.
Anyway, as for me, it's happened once. Infuriatingly so.
1/4 of the way through Episode 3 of Darker than Black Ryuusei no Gemini Gaiden, the subs shifted from bad to worse. At the start it sucked. I lived with that. Near the part I mentioned, they were translated with google translate. Horrible. I still haven't finished the OVA because episode 3 still doesn't have any decent subs.