Hmm .. So you are rich , ha ?
1-In your opinion which is the best bank in Qatar? and Why?
I Think The best bank in doha is " CBQ " becuase it has the best
services , Debit cards , Credit Cards , A web site on the Internet so you can check you account and transfer money ..etc..
Finally it also has the best widespread ATM network ..

2- In your opinion which is the worst bank in Qatar ? and why?
Qatar islamic bank is the worse ever .. Bad and few services .. there is no web site .. they don't answer the customer-help line .. Bad employees ..

3-What do you think of Commercial Bank of Qatar (CBQ)?
See question (1)

I hope taht this answers could be handy for you ..

C YA