The England winger was impressed with the performance of interim coach Stuart Lancaster's side at Twickenham, despite losing out to the Welsh in the battle for the Six Nations Triple Crown title.
However, Strettle was unhappy that the match officials refused to award a try to England with time up on the clock when he touched the ball down one-handed while under pressure from three opposition players.
Television official Iain Ramage refused to make a decision because he felt the footage was inconclusive, while Strettle felt touch judge Pascal Gauzere should have assisted referee Steve Walsh a lot more given that he was stood next to the incident.
"I felt the ball touch the floor," said Strettle on BBC Sport. "If it is inconclusive you have to go with the attacking team."
He added: "When they showed it on the big screen it looked like it went down as well.
"The strange thing for me was that I was hoping the touch judge might have seen it because our physio was standing right next to him and he says it was grounded."
England could have levelled the scores had the try been given and Toby Flood kicked the subsequent conversion, but Strettle felt his side were on the end of several questionable decisions throughout the encounter.
He said: "There were a few decisions [that went against England]. When Flood kicked the ball through and it was knocked into touch [by George North], you can't do that. He wasn't making an attempt to take possession.
"It is frustrating but we have lots of positives to take from the game. It is how the team responds now to our first defeat.
"We showed the public what we are about as a team - we are good in defence but we can take it to teams in attack as well.
"They came to physically dominate us but we stood toe-to-toe and smashed them back."