Warehouse is very hard. I'm sure it was meant to be that way. I think it was meant to be a place that requires players to team up, to encourage team play. Whoever added Warehouse was maybe thinking we already have fun things that can be solo'd - let's force a few challenges to require teams. A team of 2 is not enough? Okay, recruit more.
I once built a team of 4 BG companions, leveled them all up to 24, gave them all the best incinerators and hit WH solo. All 5 of us were wipe out within 10 seconds. Twice. I abandoned the idea and never go there solo, but only ever go there with at least 4 real players.
Same with Ares: you cannot do it with only 2 (although 2 extreme snipers can wreck the surface with practice!)
Same with California Raiders bunker. Same with Sierra. etc