You must be joking. I've built several projects, for pay, using Titanium and find it to be very powerful and fast for building even complex mobile apps. The customers have been thrilled that I'm able to deliver tons of features in shorter time frames and hence lower cost.

As for error output - you just need to look at the logs in detail (and turn them up to trace) to get details for hard crashed.

I built one project with it for pay. It is much more limited than a real native solution like obj-c, monotouch, etc.

What exactly would you do if the client came back to you and requested something titanium couldn't do?

When I was using it it had problems even moving to a page with a webview already loaded up to a webpage.

Have you built a project with a real native language for pay?

And horrible doc. Don't forget that!

The docs are pretty good, and the wiki is a wealth of information. where exactly are you looking?