Yea i always feel like i'm cheating when using them. But i can easily see certain situations where your character simply can't beat a particular boss though. If you go pure thief (with lockpicking and non-offense skills) i can imagine getting very frustrated with your character. I only use it as a backup if i can't beat the mobs normally, the scorpions tend to no go where i want them to go wihch makes moving through a dungeon longer than just killing yourself.
But yes, i think it's too strong as you only need 1 skillpoint, maybe there should've been a limit to how many you can release as well AND how long they stayed in the game. I.E only able to release/control 1 scorpion at skill 1 and it will only last for a few rounds before it "runs away".