Built for Invasion mode. Designed to sit on top of your base. Poke with ERLLas and if anything even gets the wrong idea about your base, let it have it with the SRMs and AC20
Yep, Spheroid is right. Also, there's not really enough ranged damage there to be sitting back sniping . . . If you want to snipe, get some Gauss and ERPPCs, and try that out.
A single Gauss instead of that BFG would be a nice partner in crime for those ERLLas and isn't completely useless closw up as well.