I had a 150 that had hail damage on the wings. The dents were small but there were lots of them. You couldn't see them just walking by the plane but they were certainly visible when you got close to the plane. The plane flew well and I had no problems with it.
I would not shy away if the damage is not severe, but it does affect the value. I'd concentrate on the rest of the systems and the engine. I'd also check how much it has flown in the last few years and on what kind of overhaul was done to the engine (factory, field to new limits, field to serviceable limits, etc).
AOPA Vref values a plane like that (no damage, complete logs) at around $23,200, mainly because of the time since the overhaul. That added almost $5,000 to the value. The market has been fairly depressed so I'm sure you can shave some money off the final price.
Good luck!
