They have regular events with new activities/missions. It's not just the expansions that will come.

So this is a start up pack...

Destiny is can be good game, but got me deal breaker.

The hype is a lie.

Well it's probably not getting worse.

All reviews begin with "It looks great and is fun, but..."
So more content should probably fix most of the issues.

That's not a business model we should be supporting. For $60, gamers should expect a complete package.

The game is based on events and the world's evolution in time.
Of course it's not up to its full potential at launch, seriously...

They never even tried to hide it, it was pretty well known. Anyone who bought it day one who's now complaining about the lack of content can't blame anyone but him/herself.

$60 game should have enough content to be good without DLC or expansion packs. Gamers shouldn't support these business practices.

It is not like Final Fantasy XIV. They just need to add more content to the game. The mechanics are just good. They won't need a "Destiny: A Realm Reborn".

Exactly this. "Games as a service" doesn't give the industry a pass for the base game being underwhelming--ESPECIALLY when they're so hellbent on pushing pre-orders to get sales at that price. 

DLC should build on an experience that's already solid and feels complete.

Its not really "lack of content", its more that the content that is there (excluding the PVP) just isn't very good. If that stuff was great and the game still had this much content, people wouldn't be complaining as much...