As someone without a group and plays completely on my own: No, I won't buy it.
Now, that seems a bit obvious but hear me out, I didn't really like the PVP this time around, specials and grenades were too slow to charge, the weapons felt good but the TTK was weird and I wasn't a fan of that game mode.
It's funny, since once I learned I wasn't going to enjoy playing the game solo, I got hooked really fast to Crucible. Sometimes it was bullshit, but others it was a lot of fun, so I was gonna get that game for the damn PVP and I didn't liked it.
The rest of it seems fine, but it's almost like I wanted to buy Mario Kart because of the battle mode with the baloons or something like that, it's far more my fault than the game having details I didn't like, really.