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.
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"I like you, when the world is mine your death shall be quick and painless" Stewie Griffin; Family Guy