However, the Champions League success that the club's ownership craved was hard to come by as PSG failed to make any real strides in the continental competition.
Emery announced back in April that he would leave the club and was appointed manager of Arsenal soon after, replacing Arsene Wenger.
"I'm happy for Unai Emery that he has been given this chance with Arsenal after what was two very frustrating years with Paris Saint-Germain," Paddy Power ambassador Petit told Goal.
"He won the French title at PSG, but they didn't succeed in the Champions League and some players didn't show respect to him. Also, the president of Paris Saint-Germain [Nasser Al-Khelaifi] didn't show him respect either.
"Too many people are trying to be in charge at PSG and Emery was left alone. I think he was very sensitive about this. In his final weeks at PSG, you could see a change in his personality and a change in the way he was doing things. He knew he could not win the battles at this club.
"It was not just Neymar. It was other players who would try to influence things and if they didn't like how something was being done, they didn't go to the manager, they went to the president.
"I would say that 80 per cent of the dressing room were doing whatever they wanted to do and that is not a position any manager wants to be in. You have big egos at PSG and they don't take orders very well from anyone.
"Emery is now in a job where his vision for the game can be laid. There are not so many egos at Arsenal and I think everyone is following the way he wants to go. I'm happy for him."
And the Spaniard has got off to a solid start at Emirates Stadium with Arsenal having won nine and drawn three of his first 14 Premier League matches in charge of the club.
Emery's Arsenal currently sit fourth in the league after a 4-2 win over rivals Tottenham in the most recent north London derby.
Next up for the Gunners is a clash with Manchester United, and Petit was critical of Red Devils' forward Alexis Sanchez in the lead-up to Wednesday's clash for "going into hiding" after his big-money move from Arsenal.
Emmanuel Petit is a Paddy Power ambassador and you can read his views at news.paddypower.com.