@ Frostmourn & Metsujin
I think we agree that a good story has to establish its point quickly, because its important for the reader to know where we are going. It works like this in One Piece, Naruto, Kingdom, HxH somehow, Toriko, FullMetal Alchemist, Bakuman ...
Mangas that don't follow this rule but want to succeed try to emphasize character develpment through the story and introduce long term foes since the first volumes of the manga. Magi for example works like this, we don't know where we are exactly going but the story is still about Alibaba and Sinbad. Gintama on another hand is surviving a lot through comedy.
Then there are mangas which fail at establishing a goal and kill off the main vilains too soon : Bleach is the perfect example. Who reads Bleach today?
So now back to what you said. you tell me that the point of Fairy Tail is the story of the guild and I think that you're right it's the goal of Hiro Mashima. But is accomplishing tasks that the master gives you that entertaining?
Wouldn't it have been more entertaining to have a main hero chasing after dragons even if the 3 or 4 other main characters were following their own agenda?
Plus if it's the story of the guild then I expect character development. Now if we look at the guild, its a lot of people. Is it really possible to care about so many people? Plus most of them are NPC with random face, we don't even know their names they are just here to say "there are people in the guild", others have a name but they have been spending their time in the building since the first arc : Droy, Jet, that telepathy guy, the two hunters ... And then there is the inner circle : Makarov, Levy, Mirajane, Gajeel, ... but all in all, all these characters get no development at all except for a few shipping. How should I care really? They could all die for it doesn't matter at all.
All in all having a story about something as big as a guild but chosing to develop only 4 of them is perfectly stupid. Imagine the adventures of Luffy, Zoro Nami and ... their 60 buddies : John 1, John 2, John 3 ... John 60. Just get rid of the 60 and keep the three main chars.
And yeah Makarov should have died on Tenrou, that would have been far more meaningfull.