What do you think average means? Average means if you take a set of data (in this case open world games) then you believe it to be in the middle of that pack. I'd love to see all these open world games that you think are better than Watch Dogs for it to be middle of the pack.
The word average is ridiculously overused by people that don't think something is brilliant and think average is the next step down.
GTA 5 is probably the only Open World game I'd say is better than this, and that's nothing to be ashamed of.
I think average means, somewhere between bad and good, unless you have a different view? It is not some damming negative review. I don't think it's a bad game, nor a particularly good game, I'm having a bit of fun playing through it.
I seem to be one of very few using the world average, so I'm unsure how it's over used if it's only a couple of posters using it.
Anyway; there are a lot of open world games
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Skyrim is open world, Crysis, Saints Row, Assassins Creed, Fallout 3, InFamous, Batman Arkham City, Minecraft, Prototype, Just Cause are examples of open world games.