Ok, let me break it down for you even further.
Size, grandness, in this context refers to the normal things you would mean when talking about games. Actual map size in terms of m^2, number of unique -types- of locations, number of items, number of different enemies, number of skills, number of build variations, number of gameplay modes, number of players that can play in a single instance.
These are objective aspects.
And in those aspects, Destiny isn't grand. It isn't small by any means, but there are many, many games out there that are grander in every aspect.
THAT's what I mean by Destiny not being as grand as some (many, especially bungie themselves) make it out to be, objectively.
And this, I just dont get.
Responsive? What makes the guns more responsive than CoD, BF or Doom?
Sounds? The sound design in the game isn't bad, but I can't see how it's anything special. Listen to BF1 to hear some truly stellar gun sounds.
Melee and jump mechanics are responsive? Have you tried Warframe (which is a comparable game in many aspects)? Also, how can you feel that the jump mechanics are responsive; it's like super floaty. And the melee mechanics; i mean how responsive can they be: You click a button and bang you attack, just like any other shooter. Then we have super charged modes but those are just chaos and half computer controlled.
Sub class weapons and skills; well, I don't think I've ever heard someone praise destiny for having lots of class depth and variations. I've even seen people on this very board claim that the lack of variation is a feature, and important to the game.
Crit sounds, well you're back to sounds again. And one particular sounds, at that. And seriously, sounds can be nice, but when you list: sounds in general, a single particular sound, and "melee mechanics" as 3/6 core reasons why gunplay is super awesome... well that just says it all to me.
Preach. D2 is D2. Nothing else.