I've personally noticed, as well as my recruit faction members, that pig rats are definitely overpowered. A swarm of pig rats could easily down any new player in a matter of seconds. That's understandable from death claws, or floaters etc. But pig rats? Come on. I've also noticed in mole rat vs. pig rat encounters, Ironically, pig rats always come out victorious yet they give 50 experience points, where as mole rats give 120. Mole rats are also significantly easier to kill. My suggestion is to maybe do some work on the pig rat experience points, switch their experience with mole rats or possibly just boost it to 100. It seems unfair to make pig rats worth less than mole rats, even though they are stronger. Point proven.