Inquisitor starts being very fun when you get 38 AAs (1+4+4+8=17 in KoS tree for 100% melee crits an 21 in EoF tree for Battle Cleric), but that's not that big of a quantity, honestly (usually by latest T3 or early T4 if you concentrate on solo quest hoarding, you will have that quantity for sure).

After that, it's just a breeze up, and you can solo really easily all those T8 mobs everybody complains about.

And then, nowadays and thanks to the myth click, all raiding guilds want to have 2 inquisitors in their permanent raid force, so it works pretty nice both ways.