Kirby is either overpowered or his games are too easy.
I think it's both though.
Rabid enemies in Borderlands 2 are pretty OP. Very fast, deals at least twice the damage of its normal counterparts, and have considerably more HP. The only things that make them easy to dispose of are Tediore Reloads and possibly Slag.
Look at it this way if you haven't played it. If they are on the same level as you, they can run up to you, attack you, and take you down to below half health with one hit. Through your shield.
Yup. They can take a pretty ****ing ridiculous amount of shots to take down.