To summarize, these were the different plots to each True Blood season:
Season 1: As beginnings usually are, it's more about the characters but the main plot aside from Bill and Sookie's budding relationship, was on the Bon Temp Strangler(which ended up being someone no one expected and his rage was based on anti-vampire bigotry ).
Season 2: Plot #1 was Eric asking Sookie to help find his maker who has gone missing. It's in this season we're introduced to Rev. Newlin's Church of the Sun who wants to wipe out Vampires. Of course he's portrayed as a loony fundamentalist Christian who is blinded by Vampire bigotry. Of course his issues with vampires are quite founded. Plot #2 involves Sookie's friend Tara who meets up with a woman who turns out to be a Maenad and her powers sends Bon Temps into debauchery. Eventually Sam & Bill conspire to kill her.
Season 3: Plot #1-Bill is kidnapped by V addicted werewolves who work for the Vampire King of Mississippi who wants Bill to be a sheriff and hopes Bill will help him win the hand of the Louisiana Queen. Of course the Vampire King is already hooked up with a guy he's been betrothed to for several centuries. Bill relents until he finds out that Russel(the king) is actually out to acquire Sookie, who, as it turns out is actually a fairy(as in Tinkerbell...no I'm not kidding) because legend has it that drinking the blood of a fairy can help vampires walk in sunlight. Russel also uses Eric to get Sookie as well as his army of werewolves. He also has a vampire he uses named Franklin who becomes infatuated with Tara who he kidnaps, keeps tied up, and basically rapes her at his behest. Eric finds out that Russel is the one who killed his family when he was a Viking and sets out on revenge. Which he eventually gets, so to speak. Plot #2-Sam sets out to find his real parents to find out where he came from. Turns out they are white trash and his mother used to be entered into dog fights(they are a family of shapeshifters) and now they use Sam's brother Tommy. Sam eventually takes Tommy to try to straighten him out but in the mean time Sam discovers his dark side. Plot #3: Lafayette finds love from a male nurse and after a while they try V together(V being vampire blood which has amazing qualities. Too much to get into right now) and after tripping, it turns out that Jesus is a Bruhu(male which). Plot #4-Arlene(waitress at Sam's tavern/restaurant) turns out to be pregnant with Rene's baby, Rene being the 1st season Bon Temp Strangler who was killed at the end of that season, and she's worried that the baby might turn out to be evil like Rene. She doesn't want to have an abortion because she doesn't believe in it yet she gets help from another waitress who happens to be a wiccan who gives her a potion of some sort to self miscarry but it doesn't work, much to her chagrin. Plot #5-Jason, Sookie's brother, wants to be a cop but he's dumb as a bag of broken hammers but he tries anyway and basically blackmail's the new Sheriff, Andy because of something that happened at the end of season 2 to push him through. In the mean time, Jason becomes infatuated with a girl he sees at a backwoods homestead of meth dealers but she is hesitant to hook up with him because she's been promised to her brother/cousin(talk about something that would take too long to explain) to preserve the family bloodline because it turns out that she and her family are Cat People(like the Natassia Kinski movie where they turn into panthers). Plot #6-In an attempt to ween Jason's friend Hoyt away from Bill's progeny, the young Jessica(a former fundamentalist Christian teen, yes teen, she's supposed to be 16 or 17 years old,who Bill was forced to turn into a vampire because he had killed one protecting Sookie), Hoyt's overbearing mother, hooks Hoyt up with a very pretty but annoying girl named Summer(a bane of the producers, she's a good moral Christian girl so we must paint her to be a fool), and even though he dates her for a while, he hates her and loves Jessica. The season ends with Hoyt renting a house and asking Jessica to move in while his mother is showed buying a rifle.
Whew. I know I missed some stuff with season 3 but keep in mind, all of this was packed into 12 episodes. There was way too much going on for just 12 episodes. The season had no real direction. I still like the show but for Pete's sake, 1 or 2 plots with a subplot or 2 isn't bad but with maybe 1 reall plot and several subplots was just too much and the story suffered.