True. If you know the person you want to date games a lot, then it's also your responsibility and your choice to date them.Actually, let's flip it around for a moment, because so far, everything has been falling into the lap of the gamer, when in actuality, both partners are responsible for assessing each other before they get into a relationship.
Sure, a gamer shouldn't devote all of their time to playing video games if they are in a relationship with someone. Even two gamers who are involved with each other have to put down the controller at some point; otherwise they are no more involved with each other than gaming buddies (nothing wrong with that, but its not a committed relationship). Ignoring your partner is a sure fire way to piss them off, especially if the source of your inattention is some hobby.
However, the fact that someone is a gamer is not something that just pops out of nowhere; there is no way in hell that someone didn't know that the person that they liked spent most of their free time playing video games. If they are devoting a bunch of time to gaming before you engage in a relationship, there is a really good chance that it is going to stay that way for a good chunk of the relationship (if not the entire relationship). They could change a little bit, sure, but one shouldn't engage in a relationship with this expectation because there is a lot of crap that one has to go through before anything changes (I believe we criticize Disney movies and romantic comedies for this sort of thing). Getting pissed at them for paying more attention to video games is understandable, but only to a point, since one should have realized that they were a gamer to begin with.
Gamer: "Can I give this person the time and attention that they deserve?"
Partner: "Can I expect to receive the time and attention that I deserve?"