I'm sorry, aivadroid, but even if you do get your friend to play GW2 with you, he'll most likely get into it thinking how stupid it is, and all he's going to do is to look for faults in the game. I don't really believe that GW2 is a good start for a person like that, really - make a bet with him or something and try to get him to play something simple and addictive on playstation, Xbox, or just PC hotseat, drink bear, punch each other a few times, just keep it to social interactions he knows. After you rid him of preconception of games being boring as fuck, he might enjoy GW2. Buut I don't really believe you'll be able to even finish the first step, let alone second - if all your friends are like that, he'll most likely be too afraid of public humiliation of 'playing videogames'.
edit: Yes, drink bears. I mean, you're from Sweden, that's what you do, right?
To the first post, I'd say people just have their own tastes, and sometimes people make opinions about something before they've tried it. If he plays it he will pretty much hate it, or maybe like you less. You really just have to find something he would like beforehand. Gaming can be a tough thing to get into, we longtime gamers forget that sometimes.