From what I can tell, rather than a simple difference in expectation (which could explain your positive experience vs others), it seems to be a "comfort within uncertainty" difference that, from what I can tell, is a personality trait!

You're comfortable with the uncertainty, and accommodate it in your use and expectations. You're left feeling good about the experience, within that uncertainty. Others are repelled by uncertainty, so will have a negative experience, regardless of how well it may work for a subset of tasks they try, because that repulsive uncertainty is always present.

I think it would be interesting (and possibly very useful/profitable for the marketing/UI departments of companies that use AI) to find the relation between perceived AI usefulness and the results of some of the "standard" personality tests.