Reasons why Manchester City are rubbish in the Champions League

Manchester city are on the verge of  being eliminated from uefa champions league competition in the group  stage, even they can  miss out on europa league.

   manchester city are not good enough in the competition or let us assumed that they don't have enough confident in the competition. these are some reasons i think they are rubbish in uefa.
 1. pellegrini fall shot after the best
2.Champions League apathy permeates the club.
3. no homegrown core