I don't know about ... interesting, but Polish soap operas in general are pretty easy to understand. Especially Klan (is it still around?) and M jak Miłość had/have characters with very clear enunciation who don't speak too fast and who stay clear of dialect and slang.
For smarter native speakers they're probably a little boring but for learners they're pure gold.
Also some of the Polish dubbed shows on kid networks (esp the Suite Life and Just add water) are easy enough to understand (though being aimed at children they might not be so interesting in non-linguistic content and being translated aren't always so completely natural Polish).