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Bittrex is fine but they don't have many Altcoins.

If you are looking for Altcoins Binance is the Exchange​ to go.

I have almost all of the top coins on bittrex. Plus I am not a big investor. So I feel bittrex is fulfilling need of the time. But I have some friends who are eager to invest in bitcoin but sadly cant get themselves registered. Hope these exchanges upgrade their server capacity soon.

After the last Bull Run of Cryptocurrencies in the last days of 2017, ​almost everyone is eager to join in this Train. So exchanges are having a hard time Coping with​ the sudden influx of new users.