Bendtner has had his chances regardless of the typical DM rant above. No one wants to buy him for a reason. He isn't good enough full stop. On top of that he's an idiot. If he didn't think he was the best player in the world he could have secured a transfer / loan to a few not so glamorous clubs instead of leaving it to the last day of the window to take whatever loan was still available.
Firstly lots of clubs have tried to sign him, Juve signed him on loan, Sunderland the year before and Arsenal have turned down multiple offers as they were too low over the past 3 years. The german club that had a deal almost done except it was financially unviable(despite all rumours saying Bendtner was happy to take the lower pay they were offering) which all points to Bendtner being the problem
As for at Arsenal, he was one of the best players on the pitch in all his games against Barca, he works hard and performs well whenever he got the chance, he's never had a full season of appearances at Arsenal, if I'm wrong show me the season he got loads of games for Arsenal that I'm missing?
We've got the season he had 17 starts, 9 goals 2 assists in the league, the following year he had 19 starts(in all competitions) 12 goals 6 assists. THat is league 13 starts, 6 goals, 5 assists, champs league 5 starts, 5 goals, 1 assist. Horrible season, horrible. In that season he didn't start at all consistently (and was injured earlier in the season) until after Jan. After 2 games to get some form, starting the next 13 games he scored or assisted in 11 of them.
The year after that he got 3 league starts, 2 goals/1 assist, carling cup 4 games 3 goals, FAC 5 games 3 goals/4 assists, World cup 3 games 1 goal/1 assist, one other international.. 1 goal. He plays, he scores and assists, and he was used out of position frequently at Arsenal, at left and right wing(horrible on the left by and large, pretty damn good on the right). The only issue he had at Arsenal was not being used enough, his scoring and assisting record for the amount of minutes he played/starts he got has ALWAYS been exceptionally good for a 20-23year old player.
Anyone saying he's a bad player doesn't know football, it's also clear as day there IS interest and people do want him so saying otherwise makes you appear ignorant. Which of those seasons above did he do horribly in? Despite Wenger not using him in the league as much(plenty of short useless sub appearances but no run of games, almost no starts, 99% out of position that year) he still maintained scoring and assisting in ALL other games he played for Arsenal and Denmark in his best position.