I just went through the same switch.
For Movies, I used a tool I found
http://yabb.jriver.com/interact/index.php?topic=47574.0 that does "MyMovies to MC" conversion. Export your collection of Movies to xml, Then run the tool using the xml. Then MC sees the movies just like it is in My Movies (Actually I think the tool puts the description somewhere else (it is four years old), but it is a simple thing to move it to the right field using "Copy Move Fields" in MC.
I can help with TV shows too. I have had better success with a "dot" between the season and episode. But S and E do work. I use "The Renamer"
http://www.therenamer.com/ to look up titles I am missing and it renames them anyway you want. I use the default and MC picks them up.
I know of your complaint about titles not being importable. Here's the trick. Instead of importing the folder, do an Autoimport of the TV shows, and choose Get TV and Movie info there. It will scrape what it can, and not complain about the unscrapable ones.
Don