Yes, Kanye has too big of an ego and it is the main reason a lot of people do not like him. He is a genius when it comes to music. But he should stick to writing songs. His tirades go on for too long and often do not make sense.
In 2013, during an interview with Jimmy Kimmel, West compares himself on a level equal to Jesus. He believes he is as talented, perhaps in the sense that he is able to "create miracles" with his music. While many agree that West writes enjoyable music, few would consider this on par with the miracles attributed to Jesus: rising people from the dead, turning water into wine, etc.
Kanye West has always been arrogant and outspoken, and has offended many people. The fact that he has been committed may or may not have anything to do with his ego, but it shows that he is clearly going through some type of mental issues right now. Hopefully he can get the help he needs.
No, Kanye does not necessarily have too big of an ego. The fact that he voluntarily committed himself is one indication that he realizes he is simply human and sometimes runs into problems that require him to slow down and take care of himself. Maybe he did let himself go too hard and got run down. It happens.