Realistically speaking onslaught has been extremely disappointing compared to all the previous expansions.
What I got out of onslaught was that the devs made a few cut scene reused a few voice dialogues, but its mostly just 2 planets go here kill this guy then go there kill this guy and then go find and kill malgus but he escapes end of expansion. maybe 1.5 to 2 hour long. minus any travel time maybe about a 30 min expansion.
just kind of weak tbh, there are people who are saying onslaught is the best expansion for this game but I just don't see it. I'm sorry. Ive been playing since 2013 and played all the expansions and enjoyed them all, but onslaught? are you kidding me? pre - expansion content for older expansions is longer then the entire onslaught expansion.