Why would you recommend him to avoid bittrex ?
The fact that they had to lock accounts and ask them to verify does not make them out of the system, and if you feel you want to go ahead with an exchange that would not really bother about verification, then it is your call.

Definitely I blame them for not at least updating each of their users before the ban but you have to understand that they are being subjected to US regulations and one would just have to deal with the verification process.