The defeat will affect both the Dragons’ final placing in Group A and their seeding for the 2016 European Championship qualifying campaign.
The Cardiff City forward was frustrated to concede the opening goal from a set-piece, having been punished by similar errors in the past, and believes Wales' performance deserved a positive result.
|11/1||Wales are 11/1 with BetVictor to beat Serbia 2-1
"Our style of play is suited to the players we have, but I feel we can do a bit more. I think sometimes it gets too easy for us. And that’s not something I’ve said often when talking about a Wales shirt.
"If we could just turn that great possession into goals then we would have a chance of really doing something. When you look at the likes of Jonny Williams who is such a good player. Aaron Ramsey who is brilliant, and with Gareth Bale to come in, it’s frustrating."
The forward praised Ramsey’s recent displays and says he always felt the Arsenal midfielder would eventually demonstrate his ability after taking some time to return to form following his serious leg fracture in 2010.
"It’s the best I’ve seen him," he commented. "I’ve taken more of an interest in him than any other Wales player because his father is from the same area of Cardiff as I am. I knew him coming up as a kid.
"When something like that injury happens to you, you have a lot to deal with. He’s had a couple of personal issues going on that people don’t know about and also you don’t really know what goes on in a young footballer’s mind.
"But what he has been through, the injuries and everything else has helped him to become the player he is. There isn’t a person out there in football who didn’t expect that kind of performance from him at the moment. He has been capable of it. We are now seeing it."