I don't really care about the story behind them, because in reality they are just larger humans.
People will go for them because they look much better in armor [due to their size]. There is plenty of more original races in the Guild Wars universe - Jotun, Frogmen, Tengu to name a few, but Arena Net decided to do yet another humans. I can only suspect that this decision was made due to the issues with limited resources and I really hope that they will avoid another place fillers in the future expansions - because it's cheap.
So You don't care about the story behind eh?
Alright, i can accept that. Please tell me Whats the "point" of the other playable races if not the story elements the present...
"The Norn need no armies. We are Norn."
With that telling 4(!) Norn went against the armies of the Grand destroyer/Primodus.
So how do you make a people that value honor of hunt above all, get together, like all together, and go to war...
Should be pretty interesting story.
Oh wait, you don't care about story, right.?
Then, With all due respect, Ask yourself - "Why am I playing this game?"
GW2 is an mmoRPG. Not mmoGYAO (figure that one out yourselves). The devs have, several times, sad that they intend to bring Story(gasp!) back to this mmo. If you say you don't care about story in GW2... Do some research before you buy games, then go complaining on the forums about something that is the core of the game.
If there is 1 race I can ask "what's the point?" it's the sylvari. Not due to lack of story/differences, rather the opposite. The abundance of odd hints in it.
Oh and about the Minor races (tengu, Hylek, skritt etc) they are there, But, except tengu (of whom we know little), it is rather obvious that they have progressed very little during 250 years since GW.
Well to find a good game to compare to...
WoW had goblins, up until Blizz made them playable (not to mention the worgen, of whom so many have been killed before as mobs)...
GW2 in unique in that it has actual... well unique races populating it.
If you don't like the story of a race, don't play them. Just don't come back crying "why must i go to there, I no wanna!"... The very BackStory of GW2 shows that all 5 races Will come together. And It is you, the player, who makes that happen.
See you in keg brawl!