It was always good to play, there just wasn't much content and replaying it was unrewarding since you wouldn't level up and you'd rarely get new loot. And if you did want to get into it you had to work with crappy quest sequencing and tons of different currencies.
Now there's twice the content, fewer currencies, logical story progress, and you get tons of levels and loot left and right.
I played 8 hours of Destiny postgame and used the same gun the whole time. In the last 3 hours of play I have changed my main gun 3 times.