I think summoners are quite fun now with the new skills. You get pretty cool skills at a quite low lvl so u can start to aoe at a early stage. They can lure 3 extra mobs (You can lure 3 Mobs, but as a summoner u got a pet which allows u to lure 3 extra mobs) -> faster solokillingspeed. They do decent in PvP, are great Killstealers for deadfront (if the players knows how to handle his char) and they are perfect Char for solofarming which is a maint part of the endgame due to their pet. the killspeed is quite good aswell, you can consider them as a damagedealer eventhough mages and hunters do way more dmg in a short time.
I don't recommend Bagis coz they are crap in PvE, Mages coz they are quite boring until they get their lvl 92/98 skills (and even then, they arent really fun coz ur rly great dmg comes with lvl 120-130++), AKs coz they are the most expensive char ingame (they usually need 3 wepaons + 1 shield, dependend on the build ofc) and Hunters coz it needs skill to solo with them in my opinion. segnales are boring, i don't like to play healers at all, still it's ur choice.
Btw, there is no real farming for stuff for ur new chars. Chose the char u want to stick to, lvling takes a lot of time so u dont want to do the whole procedure again

it's not like d2.