What I've seen so far of the D2 story has all the tonal range of a Saturday morning cartoon, so this actually sounds pretty good to me.
Nolan North is a really bad ghost, but also the ghost is bad. They didn't know what to do with the character (also probably the entirety of Destiny 1) so they made it into a comical side-kick that talks for our character (the one thing I did like about D1's story was that our characters spoke when spoken to). Anyway this is the worst possible direction they could have taken the character.
I was watching somebody play halo reach on a stream, and it looked pretty cool. the story at least had felt like it had some maturity and emotional gravitas, it made destiny look silly.
been playing the beta for a few hours and have thoughts! I will wait for others to catch up though before I share too much.