Yes, I was a level 16 human priest, I found it very fun to solo and cast buffs on everyone I saw. It was also nice cuz when I was gathering quest items, I would heal others, they'd ask me to join them, so I got more EXP and items/copper, then I'd go off when I got the needed item. Soloing as a priest is just like soloing with any other class, you have to know when to use your spells, and IMO Inner Fire and Power Word:Shield are incredible. I went tailoring/enchanting and made myself a wand, it was great for runners and it did arcane damage (great since the priest lacks arcane damage attacks). I also trained in staves because they have decent damage and nice stat boosts to INT and SPI.
"I like you, when the world is mine your death shall be quick and painless" Stewie Griffin; Family Guy