This was one of the things that drove me nuts about the home base.
I spent a LOT of time reinforcing, trapping, designing, etc. the storm shield generator in the middle of the home base, to the point that nothing would get through, before figuring out that on the 4th defense mission, you actually build other generators, and none of anything I'd built mattered anymore. Which was... great, I guess?
I haven't run into many... or really, any bugs I can think of. Overall it has felt very solid.
The one thing that's really got me worried is how random progression kinda feels. There isn't a way to grind towards unlocking heroes, or schematics really, it's just rolling the dice with boxes. Similar to Overwatch, you get those boxes by playing, and you get a lot of stuff in them, but unlike Overwatch, they're part of core gameplay. Wanting stuff I don't have helps feed the addictive nature of any gambling based system, but... I'm worried that once I know the game well enough to know what I'm really hoping for, this whole system is going to be frustrating at best.
Game plays great. Shooting feels good. Looting is fun, crafting is simple enough to not get into too deep if you don't want to. (Other systems seem to have taken a lot of the load for deep strategy, etc.)
It reminds me of a more free-form version of Dungeon Defenders, with a lot more going on, and more enjoyable combat for the time being, so, I guess I'm skeptically optimistic?