Pine will burn, but it burns fast, and there are only a few types of pine that give off good heat. The rest are pretty soft and only have limited heat, and they all have a lot of pitch, and so generate a lot of creosite in the OWB.
I do not go out of my way to get any types of pine here. We went through a half cord here this winter in about a week. It was free though. I forget if it was Ponderosa or Western White Pine. Not my wood of choice, but it will certainly burn! :rockn: