I cant see what all the big fuss is about.
Petrov at this moment in time is a 3rd choice left winger but he isnt just any old 3rd choice left winger, he is a injury prone, miserable, moaning 3rd choice left winger!
Bentley is a good player and will certainly add something different to the squad. He is a great crosser of the ball and will be a major asset from set pieces.
We have had a great start to the season but I believe that we still give the ball away too much and someone like Bentley who has excellent passing ability should help combat this.
People need to forget about the deal 'cost' itself, Petrov at this moment in time is worthless to us, if he stays he will earn upwards of £2.5 million per season and play no more than a handful of games. To get £5 million + £2.5 million per season knocked off the cost off Bentley is good business!