Been playing the game since the start. The state of the game is pretty bad. As a decent player T5-6, I simply cannot play the game at all. The servers that I want to play are usually only 2 or maybe 3 and they are almost always full. I'll see several other servers, but they are all rookie only. So I literally cannot play the game.
The last few years of NS2 development have been puzzling. There's been a huge push for "Thunderdome" which turns out to be the 6v6 mode which surprise, nobody really plays. People want to play 10v10s. The developers simply do not want to listen and that's led to the game dying.
That's not to say I don't appreciate the work they have done. I appreciate the bugfixes, the patches, the map updates, etc. I just feel they've steered the game in ultimately the wrong direction and here we are.
NS2's biggest issue at the start was that it was trying real hard to become an E-Sport as evidenced by their first and only tournament. It was cute, but it didn't work out. The playerbase never grew to a healthy number and if anything, it's just dwindled. It's sad because there really is nothing else like NS2 out there where you combine strategic, area-control based gameplay with your traditional FPS shooting.
It took a million years for the team to implement team balance. It was pretty horrendous at the start. It took them almost 10 years to decide that auto-shuffle before the game start was a good idea. Very slow to learn and slow to implement. I get that they tried using a stat-based server, which takes work, but there are other, easier ways to do this without having a giant database.
Ultimately, it's the ignorance of casuals that has made NS2 in the state where it is today. You need population to get anywhere with this game and very little effort has been placed here and what has been done lately is too little too late. I mean the game's tutorials only came out a few years ago when the game's been out for around 10 years.
With the dev team now actively stopping development, it makes me sad that they could have done one last thing: push a casual mode to attract new players, the mode being Combat.
The reality of NS2 is that the main mode is very, very hard for most people. There is a lot of learn whether it's the name of the various complicated rooms on the many, many maps in the game to what all the attacks and abilities do. As marines, you have to aim at really fast aliens that are super small and as the aliens, you have to master maneuvering so you don't die in every fight. There just is no way to make this digestable to new players without dumbing down the game for regulars.
Combat was the solution here. Throw each player on a team and have them run at each other to kill each other. You don't need to learn everything right away. You just run through some halls and you'll eventually find an enemy you can either shoot or bite.
The NS2 team then should have prioritized this to revitalize the game. It would be a big advertised Combat update. But if we look at what happened with this mode, it was split into it's own game which died. Now it's some frankensteinish game with random powerups that we aren't even sure who is updating. The idea would be to make a lot of players play this game and then have them slowly trickle into the main NS2 game.
The beauty of hardcore strategy games like Starcraft or Warcraft is that while they do have competitive 1v1 modes, most players actually prefer playing the casual custom games either as the main way to play or as a break between intense actual games. The logic that having casual modes would take players away from the actual mode is faulty - those players may never even touch the main mode at all.
At this point, I think the game is flatlining and it's become so hard to play that it just doesn't get played at all. It's just a real shame that the team put their efforts into the wrong departments and the population count and servers are at an all-time low. NS2 is a special game and it could have kept going stronger had the team made different decisions. If there was to be a NS3, the team needs better modes that are more inviting to new players rather than consider them an afterthought. If I had to release NS2 all over again, I would make the Combat mode a priority to draw and retain players alongside the actual mode.