The more exchanges the better. More competition will lead to better service and prices. Especially SERVICE is very much needed these days, I can speak from my experience with thousands of dollars gone missing for several days now because of an error in Poloniex systems. No support, nothing at all.
A good review/compare site for crypto exchanges would be useful also.
I agree as service will be the edge of every exchanges, the faster their response to the problem the better. We all experienced difficulties when we trade and it's unavoidable but with a great support it won't be a burden to a trader especially when we messed up.