I agree and disagree, it's a slow grind to power up as a solo player, unless you're running comp alot. It's taken me a few days to upgrade bunker to lvl 2 due to lack of ways to get mats. However Seraph towers aren't something to guage as a solo player, that's more on luck of whether there are folk in map and whether or not you've got a good set up for add clears. Personally I run stormcaller with riskrunner, anti barrier SMG n edgewise, if there's 1 or 2 others in map, you can pretty much control the area easily