While I hate to judge anyone without personally knowing him, from the evidence presented in the media he shows classic signs of alcoholism such as missing work and showing a tendency for violence. I don't base this just on biased reporting, but what actual videos of him have shown, along with interviews with his team.
Yes, anybody who creates problems for themselves because of alcohol is an alcoholic, in my mind. Johnny Manziel has a history with making statements and videos that reflect his alcoholism. This man is about to lose his career because of his addiction, and I believe that speaks volumes about his alcohol use.
Yes, I think that Johnny Manziel is an alcoholic because Manziel has been to rehab the last couple of years and has voiced his constant battle with alcohol. I think that Manziel is still capable of receiving help under the right people and football organization and turning his life around for the better.
Johnny Manziel has had a rough time since he entered the NFL. He was selected as the 22nd over all draft pick in 2014. He is now a quarterback for the Clevland Browns and has tried to make a name for himself as a well-rounded quarterback that is capable of putting the team on his back. I beleive that Johnny is a genuine guy and is not anywhere near an alcoholic.