Just enter them into GraphTV .
Graph TV is a genius website by programmer Kevin Wu.
All you have to do is enter the name of your favourite show, and it'll chart each episode against its IMDB rating. It also creates linear regressions for each series. A lot of the time you'll find it confirming stuff you already knew, but that's kind of satisfying. For example, you can see...
That Friends was a consistently solid performer, and people liked the finale.
Via graphtv.kevinformatics.com
Those two high-flying Seinfeld episodes are "The Soup Nazi" and "The Contest".
Via graphtv.kevinformatics.com
A slow decline for The Simpsons over the years.
Via graphtv.kevinformatics.com