Sliders was a good show...until Sci-Fi took over and the actors started bailing. IMO, the show had it's bright spots after the Sci-Fi take over, but is pretty much worthless after Quin left.
As far as favorite episodes, there were a bunch. Off hand, the pilot where they were in Soviet America and the one you mentioned, where they were in the British States of America (I forget what exactly they called it, it's been a long time since I saw that one).