Ayew teams up with his brother Jordan Ayew at the Swans after sealing his club-record £18m move back to the team that sold him in the summer of 2016 for £20.5m.
The Ghanaian international was dubbed a failure at the London Stadium by many Hammers fans after never really living up to his hefty price tag, scoring just nine goals in 43 league appearances.
However, in a revealing interview with the Swansea website, Ayew revealed what he thought of his performances during his time in east London.
He said: "As soon as I moved to West Ham, I got injured for a long time and then I went to the African Cup of Nations. But when I look at my statistics and my time from August until now, I think I am one of the most efficient players, if not the most efficient.
"I am not one of the players who played the most games, but I have no regrets. Things could have been much better if I had not got the injuries or if I’d played more games. But when I look at my statistics and those of others who play in my position and had more game-time than me, I don’t have to envy anyone."
The 28-year-old's younger brother Jordan is Swansea's current top scorer and he hopes he can join him in lifting the club away from relegation danger.
He added: "We have played together at Marseille and with the national team. Now it’s happening again. I am happy that Jordan is in the squad here – he has progressed a lot and he is playing really well.
"Jordan has had a run of games and his confidence level is really high. That’s important in football. He has to keep things going and now I am also here, we hope we can do a great job for the team."
During his first spell at the club in 2015/16, Ayew netted 12 goals in 34 Premier League matches and finished the season as Swansea's top scorer.