If you ask me, Manchester City has been at the top of club football for years now, however they never managed to win the champions league. I do not remember that they were ever embarrassed in the mentioned period, that is, that the winning team easily outplayed them. They always offered good resistance to the winning opponent at the very least. On the contrary, I mostly felt that they were a better team, but that they lacked luck. For example, this year against Real Madrid, a couple of years ago against Tottenham...
The cause of the draw with West Ham is player fatigue, they had a busy season.