May take some stick for this but...
When I saw the team selection I was skeptical of our engine room but I think Pellegrini anticipated this match well. Everton's away form really isn't bad at all, and they play a good counter attack. Had they set up to try and destroy the midfield battle, then Fernando and Toure could have been in trouble, but as Pellegrini expected, they conceded the centre to maintain their solid away record.
Sterling really helped make the system work, with his switches between midfield and striker areas. He was often coming deep for our midfield to set off attacks with, but would sometimes stretch play if on the opposite side to the football, making more room for Aguero and the midfield to operate. Aguero worked well in this regard also.
When out of possession, there was some signs of concerted, pressure on the ball carrier in our own half, which was good to see. (Sadly not enough, but still worth crediting.)
All in all, I think Pellegrini got this one right, tactically, but our finishing has let us down. (all credit to Tim Howard and the Everton defense who've been solid on their travels.) Unlucky City.