Interesting guide. Not entirely accurate IMHO, but to each his own.
Best KTF I've ever been a part of: 1 controller, 5 defenders, and 2 blasters. Zero deaths and finished in 22min.
Combining AoE damage specialists, ST damage, and debuffs make for a fast KFT. That's it. End of guide.
As for melee being worthless.

You should try the KTF with 2 spines/dark scrappers that are HALF-WAY decent. They are very impressive in missions 1 and 3.