Templars are unfortunately shoehorned into very few offensive styles, and generally suffer more from building for stamina than other classes do. I'm currently working on a reguard nightblade for a stamina build. I'm afraid I can't offer much insight into other classes, but I can certainly say templar isn't the most interesting choice when it comes to stamina builds.

from what I saw in the calculator, Nightblade has definately nice offensive abilities but in terms of survivability it's like... none x)
Full Glass Canon !

I think part of the fun in this game is taking classes that are deemed to be weak and trying out different strategies to see if you can make them strong. My main is a high elf templar who's currently about lvl 44. There was a point in the game where I felt this character was hopeless; it seemed that he was very weak and couldn't hold his own. Instead of giving up on that character, I read up on templar builds in the forums (check this out: http://forums.elderscrollsonline.com/discussion/130325/full-templar-class-analysis/p1), I experimented with different abilities and different combinations of abilities, I practiced my playstyle by learning the mechanics of mobs and bosses, and I forged ahead. Now I'm kind of pleased with how this character is developing.

I do admire those players skilled in theorycrafting and the precise manner in which different abilities work and contribute to the overall quality of the class, and I do believe that they are correct when they say the templar class and the nightblade class need to be improved, and placed more in line with DK and sorc. My sincere hope is that the devs are working to correct these deficiencies and by the time I get to vet level, the class will be better balanced and my efforts will be worthwhile. Although many people are impatient for this to happen quickly, I personally feel that the devs should take their time and get it right, rather than rushing to make changes that will throw something else out of whack.