Due to the co-operative nature of GW2, you are more likely to run into a positive instance than a negative one. While GW2 might be so-so, the average online community (Overwatch, LOL, WOW) is typically toxic by comparison, and as such the result is GW2 seeming like a saint by comparison. A lot of PVE games seem to have this sort of community. For example, Warframe has a friendly PVE style map, though with fewer players.