Still waiting on the devs to realise their mistake and make spellpurge combo not deal detonation damage to non mages and demons by the way.
I've been playing Templar quite a bit since release and I don't care for the combo build much either, and agree that it should probably be changed. However, I would much rather them leave spell purge alone and change wrath of heaven since having a large aoe combo finisher is something only 2 classes have as far as I know and since the other is the Keeper's Dispel, which is rarely if ever taken. Keeping the AOE detonator would give the Templar something that she does better than the Legionnaire, especially with organised teams. They could instead make Wrath of Heaven a knockdown, which would maintain it as a crowd control but would no longer be a primer for combos, or, even better, change it to another support focused ability like a way to negate ranged attacks for a period of time.
I don't HATE the combo build but i do have some issues with it, one being a severe lack of interesting gameplay. Run into mob, activate WoH, activate SP, isn't the most compelling gameplay for me. Another issue is that it essentially sacrifices a whole party member to do 1 combo, every 20 or so seconds. The other classes that bring aoe dps, are also doing other things. That ele isn't just casting firestorm and then sitting afk for twenty seconds. Also, I think the Templar is actually one of the more versatile classes and this build sacrifices 2 slots (+ shield wall or you die, so that leaves one slot) and basically all of your stamina for that one thing.
The biggest reason though is just mathematical, my Payback Strike is an aoe cleave of all enemies in front of me, every 8 seconds that, with my axe, hits for 950-1500 dmg at a cost of 35 stamina and also serves as a stun break. I can use Payback Strike 3 times (2850-4500 damage) for every single WoH/SP combo. Payback Strike is at the top of the skill tree, only takes up one slot on my bar and I have enough to stamina/skill slots/skill points to spare that i can also tank very effectively, or support, or utilize the versatility I mentioned earlier and do some combination of support/tank/dps, and do it well.
As far as showing new players something they can do, there's nothing wrong with that, BUT, it does introduces some pretty terrible habits. Such as running to the middle of the room and surrounding yourself with enemies, burning all of your stamina, and kiting aggro'd mobs back into your squishies and out of the aoe's they placed on them.