I can't think of any shows that people hate altogether, but I like a few long running shows that many think should've been put out to pasture already, stuff like Family Guy, The Simpsons, Dr. Who, and Red Dwarf (two new seasons to start filming later this year!). I'll agree that earlier episodes generally were better than the later stuff (less so for Dr. Who), but I don't let that stop me from enjoying the newer ones; no matter what, the worst episode of any of those four shows is still 10x better than 95% of the rest of the bullshit being made today.
The nearest shows I can think of that people might hate but I like are Adventures of Brisco County Jr. and Jack of All Trades, but does anyone really hate them? Methinks it's more that they've never heard of 'em or if they have they simply don't care.