In the episode about Robin's pregnancy/not being able to have children there was a lot of things that bothered me. First of all, why didn't she make a home pregnancy test before telling Barney that she was pregnant? That wasn't realistic. Secondly, the hole pole vaulting thing. No one is that stupid, and the reactions from the friends were too much, too unrealistic, too annoying. They weren't behaving like normal people.
And then in general, I feel that the show isn't really moving forward. What happened with Robin's career? When they broke up 5 years ago it was so Robin could travel the world but she hasn't really been doing that (except for those short trips to Japan and Argentina). And she was supposed to be very accomplished, but so far I haven't really seen anything.