The phrase "huge annoyance" refers to something that is very bothersome or irritating. It means that it is a big source of frustration or annoyance. Full definition
I'm curious to know if you noticed problems with color reproduction, ICC profile issues (HUGE annoyance of mine), or sloppy cutting / margins. (theabundantartist.com)
Exactly those minor things, with time, become huge annoyances and manage to generate a large amount of resentment and frustration. (marriage.com)