By comparing the rating of final episodes with an average rating of ordinary episodes, it can be seen that the TV shows with "Happy endom", satisfied the audience, much more than the serials with frankly failure finals.
The top 10 series with the best, according to the audience, the final looks like this:
"Luzera" (Glee)
"Enchanted" (Charmed)
"Newhart" (Newhart)
"Sex in the Big City" (Sex and the City)
"Road Change" (Revolution)
"Mystery Smallville" (Smallville)
"Single hearts" (The O.C.)
"Desperate Housewives" (Desperate Housewives)
"Ambulance" (ER)
"Angel" (Angel)
But it looks like the top 10 shows with the most unsuccessful finals:
Dexter (Dexter)
"True Blood" (True Blood)
"How I Met Your Mother" (Hower Met Your Mother)
"Two and a half people" (Two and a Half Men)
"Clan Sopranos" (The Sopranos)
"Star Trek: Enterprise" (Star Trek: Enterprise)
"Clinic" (SCRUBS) (Final 9 Season)
"Bad" (misfits)
"Sex in another city" (The L Word)
SINFELD (Seinfeld)
Rating of the Finals (compared with the average rating of episodes) of all the most popular serials: