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Single player is fairly short but fun

No

Get fallen order instead :)

It's worth it if you grab it on an Origin sale for 4.99. The edition which they sell on the steam store is the base game+ all skins so it's priced higher.
Besides the single player campaign you can play conquest (capture control points like in the old BF2) with bots. The AI is good and you have access to all the maps, vehicles, guns and heroes just like in multiplayer. The AI is also using heroes so you can get some pretty cool duels without ever playing multi.
There's also a co-op mode- 4 people +AI against AI.

Origin access is the cheapest way to play all those singleplayer campaigns of the Battlefield/Battlefront games.
I was young and did it for the graphics! :)

When I played it during that Origin free month, I did like the story campaign quite a bit. Certainly wasnt a 60-hour epic but it was definitely fun to play it. I'm more of a story-mode player instead of a multiplayer usually since I tend to get my ass handed to me a lot. To me for $20 or less, it would be a good for a playthrough for it and the MP is just a bonus for afterwards.

No, the story is nonsense and the enemy ai is awful. Guns don't feel great either

Singleplayer looks beautiful but the gameplay and story is pretty boring also very short. There are games modes you can play with bots though if you like pve and you can play coop online pve also which can be quite fun.

It has both of these things and a coop vs bots.