Everyone says min-sentries are overpowered
My mini-sentries don't do anything, probably because i can't placement, but i don't ever recall i time when my mini-sentry got more kills than my level 3 sentry
They're so hard to tend to, you can't fix them so you have to really know where you're putting them where they'll live long enough to kill or hold back enemies, something i am no professional in doing
I seem to hold enemies back better with an upgradable sentry though