The chance he created for himself was straightforward. Not when he received the ball but once the 1 on 1 chance presented itself a couple of yards ahead of the last defender should be simple for any centre forward.
The chance Gomes had was a more difficult chance than putting away the 1v1, due to the more narrow angle. Likewise Gomes' other chance resulted in the width of the goalpost away from scoring - at least if Rooney was getting his shots away and forcing great saves or being 3-4 inches away you could see progress and argue he's being unlucky.
You can talk about shite service but Mata seemed to score ok with 1 decent chance. We aren't going to get 6-7 golden opportunities away at a top 8 team, which is why the difference between Rooney putting us 2-0 up or level at 2-2 is a huge deal.
We can't just keep saying "well it was good chance but not a great one", these chances are ones that you still need to score 1/3 or 1/4. This is before we even talk about top strikers who create and score goals every 4-5 games out of nothing. In terms of chance creation I'd have taken 2 great chances and maybe 3 decent chances at the start of the game.
Naturally this is before even talking about the decent counter attacking opportunity that turned into us conceding because of his horrendous touch, which has been a theme of the season so far. Potentially good opportunities breaking down due to poor touches, poor passing or generally bad play.