This is a reloader, not a shooter.
I spent more time waiting for my weapon to reload than I did using it. And since the zombies are all work pocket change towards upgrades, I can barely heal the damage to my base (which I was too busy reloading to prevent, by the way), let alone buy better guns. Aiming was iffy, too: If I didn't peg the zombies dead-center every time, I missed.
Get some decent reload times and we'll talk...