Under David Moyes, Everton were often dangerous, but inflexible going forward. They concentrated on working the ball into wide positions repeatedly with quick switches of play, and crossed the ball frequently.
There was often a lack of a Plan B, something rather overlooked because what is often considered the ‘Plan B’ for technical passing sides, crossing the ball, was actually Everton's Plan A
Another problem is that Moyes is too determined to respond to the opposition's strengths, rather than seeking to exploit their weaknesses. There was a great example in 2010 when Moyes' Everton travelled to White Hart Lane to play Harry Redknapp's Spurs, and every step of the way, Moyes responded to his opposite number. He played two right-backs in tandem to stop Gareth Bale, and played Johnny Heitinga in midfield to stop his countryman Rafael van der Vaart.
But at half-time Redknapp moved Bale moved to the right, and van der Vaart to the left -- so Moyes ditched both Coleman and Heitinga, brought on Tony Hibbert, shifted Phil Neville's position, and made sure the two dangerous opponents were still being marked, but by players more comfortable in the positions Bale and van der Vaart were now playing in. That, already, was two substitutions down. This is just one match, but it's a microcosm of Moyes' thinking at Everton -- he reacted in a defensive sense, rather than changing the game offensively.