Fair point here. I don't necessarily think that narratives should be handed to you on a sliver platter, but, at least from my understanding, there is acknowledgement from those who have spent the time with it that it has something to improve upon.
Obviously this is all based upon what I look for in games so it's completely subjective. I don't expect a cutscene after every encounter, but I surely didn't have any incentive to keep with the game based on the story it was trying to tell me, or story that it didn't tell me.
Certainly the amount of content experienced and the amount of time a person spends with the game is sure to vary, but I still believe that I should have known much more about what was happening. 15 hours may seem like nothing in comparison to the whole story... but that's a substantial amount of time for me.
I'm not saying 15 hours isn't substantial, it's just comparatively small. It's a massive game and for it to truly be appreciated, I think that it needs to be fully experienced, highs and lows.
Why a lot of people consider it GOTG is because even though it does - like any game - have lows, it's highs soar so incredibly high that most games just never reach that same level.
The sense of satisfaction that the game brings is next to nothing any other game has ever really brought on for me. Most games if you can't beat a boss then you're either missing the point of the battle (target its weak spot for massive damage!), missing a pattern, or you've gotta grind and upgrade.
In Dark Souls, it is wholly possible to beat the game at level one - never upgrading your character and a lot of people have done it. Because in Dark Souls, it's more about skill than anything else. When you overcome some ridiculously tough battle, it's most often because you got better at the game and you learned how to beat him. You practiced, and you watched, and you learned.
Look at the last episode of LOLS. That final Vinny vs Artorias fight was incredible. Looking at it, Vinny looked REALLY fuckin good at the game! Compare his final battle with Artorias to his first and you can see that he got better. He started dodging more effectively, he became much more patient with his attacks and maintained himself and the excitement when he finally did it was huge!
The story is similar in that it's not easy to find but once you do, the lore is really really interesting and deep. The way everything ties in together and actually feels like a place rather than a video game world is something, again, most games completely fail to pull off.
It has the lows like being pretty damned dense to originally get into, Lost Izalith, the boss run to the Four Kings. But for as bad those lows can seem at times, it soars on so many other occasions.