Not worth it imo
You will have fun unlocking stuff, it will keep you busy
If you have everything, you have nothing to aim for

Next thing is there is a variety of different game options available on BF4. Personally I come from the Socom world so Hardcore Defuse(small scale infantry)is more of an appeal for myself. However, if you like respawn Conquest (up to 64 players) is available, Domination(which is like Capture the Flag), Rush and a few others. You can read about them on the official battlefield website(which tutorial videos for each mode) or visit the blog about below: http://blogs.battlefield.com/2013/09/road-to-bf4-game-modes/