I went to my best friends wedding late last year, I wouldn't say I was 'annoyed' but there were parts which could have been better organised.
At the beginning of the reception guests were herded into a big room with a scattering of tables; we weren't sure if this was the reception or what; there were kids running around screaming; after a while we got some soft drinks which were flat, so didn't taste very nice, and a cheese plate. None of the bridal party were there and FH and I were sitting alone; we weren't sure what to expect.
After about half an hour or so, we were herded upstairs to where the reception was to begin, so it would've been nice to be told the part priot to this was supposed to be the 'canapes' section; the reception was nice, but FH and I were seated with a bunch of randoms who just spoke among themselves, I found it quite strange that my mate hadn't put me at a table with people we'd both been to high school with, as at least I would've vaguely known some people and been able to strike up conversation to see what had happened in peoples lives since high school.
I wasn't a fan of their photographer either, they didn't make any effort to get photos of guests with the couple, so I feel like we don't even have a nice picture to take from the experience.
FH and I ended up leaving early (before the cake was cut) because it was pretty awkward at our table; and my mates mother got a little bit too drunk and started telling people how she had her money on me being the bride for her son, and how she doesn't like the brides family, etc etc, so I figured I should remove myself from that situation before I offended the bride as I didn't want her to think I encouraged all the talk about how I should've married the groom. It was a bit awkward.
It was still a lovely wedding though and it just reinforces some ideas I have about my own weddings and things I'll be making sure happen, or are avoided.