1) It depends on how it affects you. Does it bring you closer to God, lead you away or is it neutral? Is it addictive (psychologically that is)?
2) Gaming is ok. I play an online game myself. A few things to keep in mind:
You are dealing with wordly people. Don't get caught up in their worldly ways
Gaming can be a great waste of time. Don't let it take over your life
Stop playing from time to time and thank God for something that He's done for you. In other words, stay in touch with what is most important to you.
Know when to quit playing. Don't stay up all hours of the night.
Avoid games that are in any way dubious - sex, graphic violence, magic, witchcraft and such are commonplace. Even seemingly innocent games can have an occult overtone.