Buy it ?

It does really depend. I stop playing 8months ago cause of the toxic nature the game was starting to develop. Then Bliz started to try pretty hard (at least in my opinion) to push back against it.

I did just recently pick it back up and have not seen he toxicity i use to, but I've not gone into a comp match.

If you enjoy TF2 or Paladins you could easy enjoy Overwatch. As really they are very similar.