TBH, Melee Training was a too-elegant solution to the problem of stat stacking.
IMHO, There was only one class that "needed" a melee-training power: Rogue. The other Martial Classes (Fighter, Warlord, Ranger) had their primary melee attacks based on Strength, so their MBA was never an issue (except for archer-rangers, but honestly, they could USE a weak-spot). However, rogue was a melee class that used dex primary, creating a guy who one second could use his agility and grace to strike through his enemies armor, and in another swing his sword like a kid wielding a baseball bat. Before MWT, I had a rogue-only feat (similar to Intelligent Blademaster) for rogues that did just that. It was called Weapon Finesse!
Beyond that, every other class that uses weapons primary either has "magic" to describe it (swordmage, paladin) or uses Str anyway (Warden). I liked Intelligent Blademaster, and a similar feat for Paladins wouldn't have broken my heart (if only to fix a glaring problem with defenders), but I'm not sure I needed warlocks beating you down with charisma, clerics whipping you with wisdom, or druids ripping you a new-one with their con. If you want casters with some primary stat basics, do like MM or EB and make a magic-based BA.
Some believability needs to exist. Using any stat you want for MBAs stretched me too thin on that.