The only thing I didn't like was the typical close quarters 6v6 deathmatch/conquest. It just made the PvP seem like another titanfall or CoD (which I dislike). More expansive and open maps would be of more interest to me. Snipers don't have many areas to actually be a sniper, and vehicles felt crammed and meant for use only on the few designated areas on a map.
When I played this, I really enjoyed the raids and the adventure aspect and I was quickly bored by the predictable PvP.
If this PvP was more along the lines of battlefield it would be much more interesting to me. Although that probably is not going to happen, I hope they at least make the PvP have a more overall Halo feel. The elements of CoD are a little too strong.