I have to agree that right now (pre 6.78) bat is the most "OP". He has a fairly high skill threshold, though.
Bat has always been OP, it was just when Dota 2 was released he had really bad animations (and his strength wasn't that good), he was usually picked in competitive DotA matches, but lost popularity in Dota 2 for the two reasons above, until they buffed both of them.
And if anyone asks, he does have the highest level 2 damage, 7 stacks of napalm and firefly and it's gg no re.
None of the templars play Dota 2 ;_;
I mean some of them have only played LoL.