Well the issue is finding people wanting to do it, I have done emerging, minor and have skirmished in invasion systems, but have never done a Major (apart from accidently dying in one by mistake) or a mothership because I can never find a group doing them when I am active.
My experience has been like go in a number of channels ask a few times if anyone is doing them get no response and then decide emerging works for me. The most tedious thing in Eve is waiting around for other people to run content with, I think it is worse than any other game. And that is because of the nature of Eve.
Anyway it is what it is, I have enjoyed the Triglavian content that I have done so far and made a lot of ISK. I have however watched a fair few fun videos of other people running the higher level content, if you can find a group doing it when you play you should definitely partake of it.