Well it seems like wow racials basically, which rarely had any sort of major impact past vanilla(mostly dwarves for the priest racial fear ward and undead for the fear break, because every boss had fucking fear and tremor was shit). I mean there were always a min max choice almost, but most of the time the difference was so small it didn't matter.
Balance is kinda off for that purpose however, at least for the shield generator. I don't really see any reason you wouldn't want all your raid members to be settlers so you could rotate those shield generators over and over. Unless there's an exhaustion kind of debuff but you'll still want as many as the debuff allows, because it looks way OP. As a PvPer, Soldier also looks fairly strong with the CC removal+aoe knockback+CC resist and obviously the group run speed buff from Explorer if there's any sort of CTF or similar type of systems.
So yeah don't know, this shit probably just needs to get nerfed into oblivion until it's just fluff really, which is a bit sad. That or they need to be normalized with like one offensive, one defensive/support and one utility ability, then balance them with each other.