I just raised my great sword skill from 0 to 40 in 2 hours fighting these cute hares with my lv 19 pld/war. I dont think its too bad. And as an additional effect i gained up to 100 exp in each fight. I don't think thats too bad.
Don't fight Sand Hares-- it's not like they are hard or anything, but it's not worth it.
Not only does that kick of theirs deal out good damage to your party members, if you walk by a party who is battling one and it does that stupid kick, you secondhand damage.
Plus, it gives out pathetic experience compared to the other enemies. At least in all the times I've fought it.