Fair enough mate - like you, I was probably there when he scored them goals too.   You may as well add in Norwich away, Bournemoth, QPR, Hull and many others for the record.   
You reckon he slows us down and doesn't press, or tackle.   You know what....I could level that accusation, in a given selective memory, against many of our players.   Barkley has a bandwagon in our support, sing one minute he's a diamond when we win,  the next he is a dog if we lose.    Does my head in.    I know his weakness at times, I suspect many do, but don't exaggerate it as if 'he ever can't tackle, can't press' ....because you know what, I've seen him do that well, many times and sometimes more than once in a match (home and away).   Doesn't make him great at it either.    It's his job to do all this from midfield.
Our fans are fickle, 'lacks a footballing brain'....no offence, but where did that come from?    Not many who have the ability to be a Premiership & International footballer submit to this forum, so perhaps an unfair opinion, unless you are one.   He probably sees things different to us...and vice versa.  I've said before that Barkley takes too big a slice of nonsense on here...but I'd rather have him in our team than any other.      
Opinions will vary, no doubt he has a lot to improve but he isn't the only one in our team.