yes it's worth buying, game is still very populated, around 50,000 steam users (on a daily basis) and many more using uPlay launcher.
I would buy the Starter Edition and then a Year 2 Pass. Starter because the Standard edition operators are good, but in my opinion you should just farm Renown in game and just buy the ones you think you would enjoy, the $40.00 price tag for all of them is kind of overkill, half of the operators you will end up paying for won't be that fun to play.
(i rarely play Sledge, Ash, Twitch, Montagne, Blitz, or IQ so that's why i say Standard edition isnt worth)
Buying Starter + Season Pass will save you $25.00 (Steam Store price) so it's really not worth buying Year 2 Gold Edition, you COULD also use the money you just saved to buy a Renown booster to get the Standard operators through Renown. (if you really want them)
But ultimately, the choice is up to you, i've had the game since beta but only recently started playing it again after a year and the test of time has only made the game better lol, great anti-hack so you wont feel cheated out of your ranked games, game runs pretty fluently imo, pretty balanced fps, and the queue times are very good.