Was this a good choice?

No. Games like Battlefield and CoD have most of the player base move on with the next game. While there are still people that play it after a week you'll start to remember everyone of them.

I say it's worth if it's a game you like and want to play. Doesn't matter if others have moved on or not. Maybe you will find a few cool people that still enjoy it as well. :)

If you like playing it why not? BF4 was so screwed up when it came out a lot of people went back to BF3. I personally would rather play games like that on the PC. But you need a decent CPU/GPU for that.

Should have gone for Bad Company 2 on Steam! It's easily the best Battlefield imo.

Should've gotten BF4 or BC2 on Steam. The BF games are pretty well optimized so you won't have to worry too much on that.

As others pointed out, kids play the latest only as none entry in the series provide anything in MP that makes it long-lasting. (Apart from the first Battlefield, I think it is still played.)
So, essentially, they are a 4-hour long action movie after a new one is released. If you don't mind spending 13 USD or so on something like that, then it was worth it. Otherwise, no. It's just a console rail shooter after all.