TO RECAPApologies if some of the reasons are missing some text, feel free to correct, or expand the list for that matter.
1. He beat the crap out of Ben
2. He cries every Wednesday (in the US at least).
3. he is so eextremely unsexy
4. Jack faces!
5. Can never make up his mind about anything.
6. That beard at the end of S3!!!!
7. He put a hole in Ben's kidney (we shall conveniently overlook the whole removing tumor thing)
8. There is no way on earth he could look anywhere as sexy as Ben in those PJ's- benny rules the PJ's all stores should have him as their PJ pin-up
9.hes the worst leader ever!
10. Jack has way too many flashbacks
11.he´s so extremly arrogant but has no reason to be that arrogant at all
12. The producers are so Jack enamored that they thought we needed to hear his basic flashback story about 10 more times.
13. He yells a lot
14. He shoots people.
15. He's a cry baby
16. He tries to catch flies in his mouth
17. He's just goddam crazy
18. He points guns a lot
19. He cries even more
20. He's an alcoholic.
21. His tattoes were not worth a whole episode.
22. He failed anger management training
23. He wastes the battery power by over use of walkie talkies
24. He doesn't like to share. "That walkie talkie is mine - you can't have it"
25. His relationship with women suck.
26. His bedside manners are terrible.
27. He may be a great spinal surgeon, but he is a lousy doctor. He never recognized that Charlie had an addiction. Locke did.
28. He created a nonexistant Army and left the castaways in jeopardy with the Others.
29. His chest hair just doesn't cut the mustard compared to Ben ;D
30. No matter how long they stay at the beach and cannot get to a barber, his beard never grows much longer (except when he moves back to LA), and his hair never grows. The man has a Peter Pan clomplex.
31. His paranoia about his father having an affair with his ex wife drove dear old Dad back to the bottle- which led to him screwing up that surgery in Season 1 in the first place, which led to him losing his job and dying. And if the original Dr Shephard is in fact still alive on the island or some kind of Jacob, then every rotten thing he does from then on in is on Jack as well. Way to go.
32. He smells. Remember? His pre-wife Sarah said so post-op, and he had taken a shower. Kate noticed. It's only a matter of time for Juliet to catch a whiff. Thank goodness we don't have smell-o-vision. Sorry, just had to put that out there. 
33. He is selfish and wants to get of the island so desperately that he even scarifies 3 of his friends (Sayid, Bernard, Jin) for his personal goal.
34. He has no sense of humour
35. He's a loser with the girlz
36. He could not write a simple marriage vow
37. He tripped over when he was trying to run like the alcoholic Desmond
38. he keeps trying to copy Bens satchel but jacks lil 'rucksack' just doesnt cut it
39. He is such a bad example of a man of science, he could convert atheists to the faithful
40. he always makes out HES doing the right thing and if everyone doesnt listen to him then theyre extremely stupid and will regret it in the end
41. To quote Hurley on Jack's bedside manner, "What's that thing where doctors make you feel better just by talking to you? Yours sucks, dude."
42. The very first time we met Ben, Locke wanted him to be tortured and Jack wanted to stop Ben from being tortured.....yet we still want Jack dead and we want Locke to hook up with Ben. He must be real annoying for us to look past that.
43. get off the island by blackmailing Ben before the operation
44 Jack blackmailed Ben during the operation regarding Juliet
45. Jack spoke to Ben when he suddenly woke up from the anesthetics for a while until he actually asked him if he is in pain, wouldn´t that be the first thing you ask if you cut somebody open and he wakes up in the middle of the procedure or do you start talking to that person first for a while I hate Jack!
46. Jack told Locke "you're done keeping Me on this island"....once again, for all that's going on and all he's been doing, it's all about him.
47. Jack attacked and almost strangled Locke after Boone died
48. Accoding to Ben, "his bedside manner leaves something to be desired. "
49. Jack actually did pull the trigger on the gun and wanted to kill Locke!
50. Jack went to hurly to see if he was crazy and if he was going to tell their secret....not very cool of him. Hurly has enough on his plate then to be buged by Jack. This just really got me. Die Jack
51. He can't play Horse worth a hoot. I could do better than that, and that ain't sayin' much.
Die Jack 
