I see. So, I'll go with S&S/Vanguard/Champion. Same with Sera - Archery/Sabotage/Artificer. I know it's offtop-ish, but what do you recommend for Iron Bull (2handed/his-spec/little-bit-of-battlemaster?) and Dorian? Is Necromancer any good? I really can't build a decent mage >.>
Your companions, like Sera and Iron Bull, already have a designated specialization, Tempest and Reaver respectively. You can't change them. Well, maybe Cheat Engine can change them, but apart from that.
The Warrior specializations are the least interesting, which explains why your reaction is meh. Of the Warrior specializations, Reaver is perhaps the most interesting, but it has it's drawbacks. Iron Bull is a Reaver, so you can experience it that way.
Templar (Cassandra) has an interesting combo called (in these forums) "WrathPurge". Because you can get a very powerful AoE damage effect by first doing Wrath of Heaven and then Spell Purge on enemies stunned by Wrath. With the right upgrades, this does obscene amounts of damage. But that's about it for Templar -- kind of a one-trick pony.
Champion is bread-and-butter tanking. It's effective, and great if you are soloing Nightmare, but nothing exciting.
Mages are easy. Spend 7 ability points as follows:
1/ Barrier
2/ Energy Barrage
3/ Immolate
4/ Flashpoint
5/ Pyromancer
6/ Fire Mine
7/ Searing Glyph
Set Fire Mire and Barrier to Preferred and you are all set.
The rest are whatever you like, though filling out the rest of Inferno passives is never a bad choice.
Alternatively, you can go Winter instead:
http://forum.bioware...ter-mage-build/