I've used TT for a few years now, no crashing problems and no problem using it to create sites (I have dozens built using TT to make new themes).
Yes TT makes it a lot easier to make a site, but just like anything, not everyone will be successful with every tool. If in 6 months, you can't make one site, maybe you're just not capable of it without some training. I often tell people, WordPress is both the best and worst site structure out there. It's the best, when done right by someone with enough knowledge, it's the worst when done by someone who thinks it's going to be automatically simple and "anyone can do it" with time spent learning how to do it well.