Don't get me wrong, Melee Training (read: Intelligent Blademaster) is a powerful feat. However, it is also a balanced one; it only works for basic attacks, not for at-will powers. The poster says that he wants to go Elemental Tempest, which means he'll probably want the powers from the PrC to also be keyed to his Intelligence. So that's one feat that would change the attack stat of, by my count, three encounter powers and one daily (Firepulse, Earthshock, Tempest Burst, and Elemental Fury). That's pretty narrow for one feat, and I'm not sure that I like its implications. This opens the door for Charisma-fueled Dragon Breath, or Dexterity-fueled Darkfires, or Intelligence-fueled Infernal Wrath.
I don't like it. It makes characters too cookie-cutter. If you want to be a Genasi wizard, then fine. But in 4e, not everyone can do everything. Races are generally geared toward certain classes, and those who deviate pay the price. A dwarf who chooses to be a wizard probably won't get much use out of Encumbered Speed or Dwarven Weapon Proficiency, but that doesn't mean that you should be able to pay a feat tax to trade them in for something more useful.