THM is nice now but personaly i loved Paralyze, Slow and Silence abilities and we could choose either way DoT effects or Nuking...choose between PIE or INT based on the mage but it just fine now. Most of people are happy cuz they can kill Ifrit in a couple minutes or farm better with THM\BLM but THM\BLM is basicly Dark Seal, Excruciate, Thunder, Thundara, Parsimony, Thundaga for them. Ofcourse some more experienced mages can take more advantage from THM\BLM abilities and manage the battle better.
Lots of things can be done as THM and the beauty of THM is manage te battle, not just spam abilities (Thunder combo).