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Ranger basically gives you an extra party member at all times, so...it's pretty handy. The bear is especially useful as an extra tank.
Once you fully upgrade your ranger, your pets are even more useful.
The other nice thing is if you lose one pet, you just summon another one. There have been a couple of times when I was down to just my ranger near the end of a long battle. If not for the ability to summon a spider or bear, I may have wiped. Immensely useful.