Kant is actually towards the top of my list of "stuff I thought was dumb before I read the actual source material but which I now have a lot of respect for." The categorical imperative stuff is a reflection of a really profound value that Kant assigns to human life.
Utilitarianism benefits a lot from having a Cliff notes version that sounds less dumb than the Cliff notes versions of other ethical frameworks, but I don't think that is the right way to evaluate ethics. Besides, philosophy class ethics is really more of an exercise in "let's construct a formal framework that matches our intuitions" rather than "let's make normative judgements about stuff in the real world."
Utilitarianism benefits a lot from having a Cliff notes version that sounds less dumb than the Cliff notes versions of other ethical frameworks, but I don't think that is the right way to evaluate ethics. Besides, philosophy class ethics is really more of an exercise in "let's construct a formal framework that matches our intuitions" rather than "let's make normative judgements about stuff in the real world."