Phenomenology is the hardest class I've taken in college. Stuff like this:
graduate level philosophy ftl, almost the entire class dropped out. Students I got higher grades than in that class were subsequently my TA in others.
Being and Nothingness
Was that an undergrad level class?

You need background for those types of courses that maybe 1% of students would have. At my college, there's a reason that undergrad Critical Theory is taught in 2 very general and broad sections (The first covered philosophical and critical concepts from the Greeks onto guys like Descartes, Kant, and Hegel. The second covered everything from about the 19th Century onward, your Nietzsches, Husserls, Freuds, Heideggers, Derridas, Foucaults, etc.) and all of the Phenomenologists and their successors came in the second section. Because if you just go into it without the requisite background information, you're not going to know the first thing about what's going on in those courses. Even when you DO know (like me), it can be a bytch sometimes (the Lacan and Jameson days were just hilarious).
So, yeah, I didn't even taken anything focusing on one element of 20th Century Philosophy like that until grad. Giving that class to undergrads is just asking for the kids to want to shoot themselves.