Basically this.
Go figure out: I have a fx 8370 and a gtx970 and the only way I have to make sure client won't crash is to reduce texture quality to 0.
And still frame rate remains awful in Fortress maps.

they should have gotten relic's engine. it was good, it'd still hold up graphically today and it handled mass ai mobs and players without lagging at all ever.

for those of you who don't know, relic made an engine specifically for space marine.

this is how i personally feel towards it but like the others have stated lots of time would have been taken up to develop it let alone if they knew how to make one right

Agreed, but they did choose to take on a large project, with a small team.

That's entirely on them