Well lets go through the seasons.
Usually I have to feelings either teams that I can't stand or teams who were absolutely hopeless.
Season 1: Lenny & Karyn - From the 2nd episode this team was so difficult to watch, just bitter bitter behavior an almost all of it from the female. Paul & Amie, I didn't like Paul wanting to quit every time Amie would start crying, but damn it Amie stop crying......Kim & Leslie (what bitches)
Season 2: No one, closest would be the Gutsy Grannies, just get them off my screen. Not because I disliked them, but because you so knew that they didn't have it in them. I mean I wanted Wil & Tara to be eliminated, but never happened, first real time to be out and out nasty to other racers and locals (and I hate that).
Season 3: Aaron & Ariana, though I wish it happened when he was broke down crying on the road....Heather and Eve (another way for me to hate you is the we are so much smarter then everyone else....)
Season 4: Cindy & Russel (what an ass), Steve & Dave (yeah you guys have a shot), Tian & Jaree (bitter, bitter behavior towards each other worse then most teams), Debra & Steve thank god they were put out of their misery early.
Season 5: Charla & Mirna at times a team that amused me, but more often then not rude and mean spirited, Marshall & Lance (Quitters, I hate them), Kami & Karli (how did these two clueless women make it so far), Alison & Donny (damn in one episode the amount of bile is beyond belief).
Season 6: Meredith & Maria (what a waste of casting), Lori & Bolo at times amusing but often loud and bitter, Jonathan & Victoria almost don't make this list as it was so far in the season that it almost ruined TAR for me.
Season 7: Susan & PAtrick, bitter and obsessed with R & A but without any humor which Lynn & Alex on occasion had. Ray & Denna , what a ass.
Season 8: Rodgers (though I felt terrible for Brock, the son who was blamed for everything, when he was the one who was correct), Godlewskis, who just over time went really bitter and already shrill. Also really didn't like the Schroeders and the Paolos.
Season 9: John & Scott (posters kids for hopeless), Lake & MIchelle (just mean to each other and Lake was nuts).
Season 10: Erwin & Godwin, a team that could have been a good racing team if they had any comprehension of what a competition is.
Season 11: Rob & Amber (he,he though I did like this team more), David & MAry (who had no business there), Kevin & Drew (It was just painful watching them shouldn't have been cast).
Season 12: Ari & Stella what asses and I wasn't talking about the donkey, Azaria & Hendekia (Again dislike the were so much smarter, not to mention his attitude towards his sister), Nathan & Jennifer (actually was happy and sad, it was really hard seeing them in their last shots, but it was also very cool to see the team self destruct mainly due to Jennifer's attitude).