The durability buff to sentries has now made them viable for solo play against automatons. I'll be honest it still going to be tough as placement is key. Pairing the mortar and rocket sentry at long range to lock down objectives and fight battles for you. keeping the autocannon in your pocket for when situation get hairy or for heavy units that need to be destroyed. I wasn't able to use HMG to its full potential this match but it is a necessity against Automaton Mortar Anti Air emplacements and most importantly gunships.