In EQ2 right now grouping is thin on the ground for low levels who are new to the game. Templar a a base unit is a slow soloer but the AA system can get round that by building on Strenght and Int lines, hardly recommended for the uber healer it wants to be at higher levels but damn fine early on for soloing, AA farming and grinding out a few writs for your guild without unpleasant deaths from interrupts the class is infamous for.
My main is not a Templar its a Warden. But I am a guild officer in a huge social guild and wanted to stop our newbie Templars from uderperforming in guild status acquisition by making one myself and proving a point (I never told them that though).
Strength AA line cuts your interrupts and the Int AA line speeds casting time. A piece of Int gear here and there (say 4 pieces out of your whole set) and a nice Imbued weapon and hey presto ! A battle priest(of sorts) that also happens to be one of the games most impressive healers.
For my Temp, at level 40 ish I dropped the STR for other stuff but never felt the need to drop the Int, it helps in groups with only me healing to be able to dump that spot heal nice and quickly in between maintaining all the rest of the stuff.
Yeah any class can solo, the game is built for it. You get a card with 5 free respecs so can happily boost dps output and solo utlity all the way to about level 30, or even 40 then have a think about it. Eq2 is flexible and fun. Templar is a bit of a challenge for sure, its is a deep and technical healer, and very rewarding to level up.