Not seeing many ogryns in my games , but plenty of people choosing veteran or zealot. No harm in playing what you want but it sure would be nice to be paired with an ogryn more commonly.
some of the often found roster lineups i have is 2 veterans and a psyker, zealot. but i believe i have only had 4 games in one day where i WAS paired with an ogryn player.
are there not enough ogryn players to go around or what? 
PS : I would love a skitarii class in darktide, i seriously believe that with my whole being and soul. PLS 
Probably a partial result of the way you get equipment and when you unlock them. As the Ogryn, you are stuck with a pair of weapons through long periods of time so it can get extremely dull I imagine.
As I’m leveling up an Ogryn 2nd, it’s painful to level one up so I’m not surprised to see barely anyone playing them. They don’t start off with any decent damage, so they have to rely of teammates to kill things in a timely manner and that’s a gamble at the best of times…
Even with the Zealot not having skils work, it was easier for me to level that one up to 30 because at least I could kill things quickly.