When is it necessary, if ever, for a married man/woman to quit playing (online) video games?

I think it's best to approach marriage as your acceptance of who that person is, as they are. You can ask for some time together and such but don't force it on them. It shouldn't be a huge part of there life, nor should you ask them to quit.

Will you give up going to church for them if they asked you? How about if they were a huge book reader and you didn't care for reading books and just liked to watch tv... would you stop watching tv and sit around reading books together?

Each person has there own habits, and there own things that make them happy... to take them away would make them unhappy. Limiting them and asking for some together time shouldn't be a problem though.

As a common courtesy you also should tell them in advance that you are wanting some time together if they have been glued to the computer for a few days. This way they can prepare for it and know it is coming, instead of being told that day, or right then because then they might feel controlled.

Hope that helps.

I've played almost all of my games on the hardest difficulty, like Call Of Duty on Veteran and Mass Effect 2 on Intense, Dead Space on Impossible but till this day I still believe Super Mario Bros the 80s one is the hardest Video Game out there

Is the online video game playing excessive? Is their playing interfering with their job, health, marriage, etc? Video games can be viewed like alcohol. Fine in moderation, destructive in excess.

Additionally, everyone needs time to themselves in a relationship. If video games (online or not) is how the individual likes to spend this alone time, I don't see any harm in that.

I would say it is not fair to ask to stop playing but it's fair to ask to cut down if it getting in the way of things, but if it's a way to relieve stress/hobby it's should be good right? you should do it after marriage because it will be easier to resolve things

I really don't think it would be fair to ask them to stop doing something they enjoy completely, but it would be perfectly proper to tell them to tone it down if you think they are doing it too excessively.

When to do it wouldn't really matter, it's my personal belief that if something is bothering you, you should get it off your chest asap, just do it in a nice manner and it shouldn't be a problem.

How to do it would probably depend on the persons personality, but again, do it in a nice manner and it shouldn't be a big deal.