No material inherently makes a 'better' bike. Ti is more difficult to weld and make bikes out of that Al or Fe, so perhaps the builders are more careful with construction or QC and so real crapola bikes are rare.

I think there may have been quite a few ti bikes that were too damn light and broke. Or were flexy like wet noodles. There were a few companies that made full suspension bikes out of ti and that may not have been the best application.

I have a 'budget' ti frame made in Russia. I worked for the company that was importing them and I saw only one failure over the years (out of hundreds of ti bikes sold).

I don't know of any real lemons, though.