While I do agree "believe in yourself" makes sense, the series as a whole is based on a "use brute force rather than intelligence" stance, and that's something I don't agree with.
Things won't always work out the way you want them to. I do agree nothing will happen when you keep doing nothing, but "you can do anything if you really want to" is plain bullshit.
The more effort you put into things, the more likely you're to succeed, but there's no warranty you will.
I'd just like to pick up the assertion TTGL ultimately is a parody. I've got mixed feelings about that, it kinda feels stuck somewhere in the middle. The series is too goofy to be serious, and a the same time too ponderous to be a parody. It kinda feels like the creators weren't willing to go all the way to parody.
Would the series be a head-on and obvious parody, then I would be enclined to accept the shallow, horribly cliched characters, the ridiculously simple, ultra-linear storyline and the general climate of overkill.
A parody should be poking fun at everything, especially itself, going way over the top isn't enough ... at least not for me