The Biggest Loser - Opinions?

[Zen]

Ive taken several different classes, the good instructors have enthusiasm, energy, and a desire to motivate everyone to work hard.

Those sound like the job qualifications of a cheerleader. I won't comment on group instructors, just personal trainers.It's far too easy to get certified, there need to be state licensure requirements.

Edit to add: And its not ALL about losing the weight too, its about adopting the healthy lifestyle.

Which is why at least one and preferably two semesters of college level nutrition classes should be a requirement. Sadly, they aren't.
And that's how we end up with Jillian selling diet pills.