Blackjack is a skill-game when you are against real-human. Skill is needed here because you are about to challenge against the dealer's card. If you are against the house, then you are purely relying on luck.
There is a call for every turn so it depends on how far you are satisfied with your card set.
Just like in Poker, that specific executed call will be the basis of how your opponents will make their next move.
I just heard that the site blackjack.fun, a gambling site that purely focuses on blackjack, will add multiplayer features. That's the battle between skills if that will implement.
The problem is that the skill ceiling in blackjack is very low and any croupier who has completed the course will easily beat any professional blackjack player simply due to the fact that mathematics is on his side. In poker, the situation is roughly similar, but all the players are on equal terms.