It does seem to me that you're blaming the page for serving a different purpose than the one you want.
You are visiting a Cast and Crew page and upset that it doesn't have enough episode\character information. You don't have to click each actor (that is just one way to do it). Go to the
episodes cast page -- link provided in the left column of the page you're using -- and the information you sought is the third line of data. Even if it wasn't, it would be a simple browser word search to find it (which is what you have to do to quickly find it on the Wikipedia page as well).
I'm not saying that Wikipedia doesn't have this one covered better, and TV series have always been a weak point for IMDb. But beyond less than obvious navigation (which is also frequently a problem on Wikipedia unless you are going to read absolutely everything on long pages) I'm not really seeing the failure on this show.