Few things for me that need addressing.
Voice chat. Make it so others in your team can hear you, not have to connect to a fireteam and/or party chat.
Loading. Is too long and having to go into Orbit first and then to the Tower or missions is pretty darn tedious. Wouldn't be so bad if loading was quicker but it's not and makes the issue worse.
While I've put in a good 3 days worth of play and Lvl 27 (and enjoyed every moment) it's now lacking in new content for me. Doing the Strike Playlists is pretty dull now. Especially when it gives you the same mission twice in a row sometimes. There being just 6 Strike missions is really limited. It needs to be mixed up more somehow. Randomly generated Strikes perhaps?
But in all I love the game, but those issues hold it back a little. I still have a Raid to do but was trying to level up to 28 first of all, which I'm not far off but the Ascendent materials are pretty rare or take several days to collect enough of. Still needing a purple for my primary which is also holding me back a little,