The real disappointment in season 4 is the way they ended the series but if you are into the books I would end the last episode right away with book "The Good That Men Do". Go for it and have fun.
Supposedly it was the missing connection from the start of the whole show. No show can start without a cameo from a show before. They though TNG might be a good choice. It was the worst possible choice.
So I agree, watching the season 4 until the very last episode is a good idea. Skipping the last episode is an even better idea. At least ending the show does not leaves a taste of ashes.