See it's on special, over at Greenmangaming, for $9.99.
Was wondering if there's still people playing it? Is there enough people that still frequent the servers?
Also, anybody knows whether there's a single player campaign?
No singleplayer campaign and probably not worth $10. It's been on sale for much less in the past. Titanfall 2 has probably taken all their players and also sees great sales regularly.
If I were you I'd rather wait until June/July and see what Titanfall 2 goes for on the summer sales.
Yeah, TF2 is still the better option. No one much plays TF1 these days while TF2 has around 20-30 thousand players on any platform at any given time. I see it's dropped in price now, but also often on special too.