Had no connection problems on my end. It is a mix of destiny/outriders/warframe.
The world is pretty empty as it mostly spawns mobs when you're on the missions. When you enter zones it randomly places you in there with 3 other players who are running around maybe doing the same thing as you or maybe not. You start continuous story missions which mostly seem to be defend/capture this point, or clear mobs to kill an objective before they respawn type of thing, typical looter shooter stuff. There's a survival mission you can do killing waves of mobs, might be good for farming.
There's boss intercept missions, I did a normal one to check it out and didn't have much problems with it, another team mate went down like 3 times, 2 of which I was able to just run over and ajax bubble and res them. Other than that not sure what to expect for end game content except the boss missions. All in all the leveling experience is pretty bland as pointed out by the video above.
Speaking of farming, looking up how to unlock the other descendants..... what a massive grind that's is going to be through material collection and time gates for research. On top of the bland leveling you'll need to go through for each. I don't like the idea of having to hardcore grind to open another class to play, it would have been better served to have all classes available and moving the grind to specializing them in the end maybe.
The guns are ok, the tiers don't seem to make a huge difference, just better numbers, the extra attributes are mostly random I think, but there's no unique perks on named items to really separate them, although I suppose the rune system takes that place but really everyone is mostly going to take dps runes, I just started to see some interesting ones show up around level 20, but hoping maybe some of it starts to look like outrider/division gun perks.
I like the grapple hook, although sometimes it acts a little wonky like if you're trying to climb walls with multiple grabs, but I've used it as a gap closer in combat, or to get to cover quickly, it just doesn't always hook to the surfaces that you think it might.
I'll screw around in it for release for sure, pretty much never going to step foot in destiny/warframe again, outriders maybe in the future if I get the itch for it ever again, division is on the edge with me one week I wanna try some new build the next week I want to uninstall it.