I'll keep telling you this, Lopunny/Raichu, but as long as you don't know how to rice, you're not going to do well with hard carries like Andy Mage.
Templar is fairly situational. She does well against heroes with burst damage nukes, like Lina, Lion, Kunkka, and Zeus, but is countered by target area spells from heroes like Lina, Lion, Kunkka, and Zeus. She works well against heroes with slow attack speed (makes Phoenix a good ally) and hates heroes with damage over time spells that can break through her shield easily, like Jakiro, Dark Seer, Huskar, and Batrider.
Both timing and positioning are crucial to getting the most out of TA's abilities. Practice both of these things and maybe farm a little better and you'll see it all pay off.
I think I use Lina fairly well, but as I'm sure everyone has seen my bitching about it already, every fucking time I pick Lina, my team plays like shit. How the fuck can I win with this hero?