I don't get all the hate for Wenger...yeah he whines sometimes but I would too if I were in his position. They have a lot of constraints. They run on an extremely tight budget, they're the only team in the Prem that plays for more than results, and they always have a ridiculous amount of injuries, especially from international friendlies. So the results are never quite there. He is very supportive of his players and doesn't like to criticize them, and as someone else mentioned, if he called out his team for form it would damage their morale. I think they've done as well as they could have considering the injuries, so he blames other things. At least he shares his opinion, and most of his interviews are more interesting than your typical boring Prem manager interviews. Who would you prefer, an opinionated manager who actually balances the budget, unlike just about any other Premiership team, or a boring manager who spends like crazy to pick up a few extra points each season? He's great for the league and one of the all time great managers.
As for him not being successful, come on guys, seriously? What other teams have been as consistently successful as Arsenal over the past decade? ManU and Chelsea are the only ones, and they have spent a ridiculous amount of money. Liverpool spent their money poorly and are in dire straights unless the new management can continue to shell out an absurd amount of money and rebuild the squad. Chelsea is already in trouble because their core is getting so old. They have some unproven youngsters (much more unproven than Arsenal's) who don't really have a system to learn, and some old geezers that the team relies on and will have to be put to pasture soon. ManU should be fine, but they're the world's biggest team and have had a lot to spend over the years. Temporarily they've had to cut back, but I'm sure they won't in a few years. They have a lot of young players so they should be fine. As for the other clubs? City just got here, by spending a ridiculous amount of money, and they're not as good as Arsenal yet. Tottenham? They had their first good season last year.
I don't get why he's the most hated manager in England. I think it's because he's French and a purist, so a lot of people perceive him as snooty.