I think Battlefield 4 is a fantastic game! This was the first title to fully take advantage of the PS4 / Xbox One hardware at the time. It runs basically like Battlefield 3, only a bit smoother thanks to the Frostbite 3 engine. Not only does it look better than previous entries, it's the first game in the series to introduce high tick rate servers for more responsive gameplay.
BF4 Premium is one of the most feature rich packages you can get. it contains a huge variety of weapons and vehicles as well as well as over 30 varied maps, including classic maps from Battlefield 2 and 3. Even before the hype of Battlefield 2042, BF4 had a massive active player-base and it wasn't tricky to find a game to jump into. Thanks to it's community driven development, BF4 has become a favorite to many over the years.
There are some minor nit-picks. The biggest issue I have with this game is the progression system. While it's pretty easy to level up classes, individual weapons take an incredibly long time to fully level up. After 50+ hours online, I haven't even progressed a quarter way through any of my primary weapons. Even with XP boosts provided by premium, it takes a while to progress. There are hundreds of small attachments to unlock, so much to the point that each new feature feels miniscule.
The other issue I have is lack of game mode variety. The dominant game mode is conquest, which to be fair is a staple for this series. However it would have been nice to have more Rush or Capture the Flag servers. Luckily there's at least a lot of map rotation in most Conquest servers, giving players the opportunity to fight in varied infantry and vehicle settings.