The England U21 international, who has signed on a season-long loan from Chelsea, made his debut in the game.
"I wanted to go to a team that played good football and as we saw tonight, Middlesbrough play good football," the 19-year-old told BBC Tees.
"There are top players here, it's not a big step down."
Born 1 March 1993 in Oxford
Joined Chelsea at the age of eight and made his first-team debut aged 17
Signed a new five-year contract in July 2011
Represented England Under-17, Under-19 and Under-21
McEachran played the full 90 minutes, despite only arriving on Teesside on Sunday evening.
"I trained with the boys on Monday, we worked on shape play, and then I started the game," he said.
"It's my first 90 minutes for a bit so I had to find my feet but as the game went on I thought I did better and better."
McEachran was a major influence in the game during a second half which saw three fine goals scored in the final 10 minutes.
Adam Reach's curling effort put the home side back in front and after Junior Stanislas levelled for the visitors, Luke Williams secured the win for the home team by smashing a long-range effort into the top corner in the 88th minute.
"I hope Middlesbrough get promoted and I'm part of it," said McEachran.
"I've played with some of the boys when we've been with England U21 - the likes of Jason Steele, Joe Bennett, Luke Williams - so that has helped.
"I'm still trying to find a place to live up here and when I do that and am settled, things will get even better."
Boro manager Tony Mowbray said McEachran had shown what a good player he is.
"He'll enable us to be as fluent as we want to be really, and then if teams come pressing us he has the quality to pick the passes to the strikers and the other midfield players who are playing higher up.".
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