No, not by a long shot!  Over the years, clever players have uncovered several loopholes in the way casinos play blackjack.  Most of these loopholes have been covered up, but every now and then you might find a window of opportunity.
Here’s a list of things you should research if you really want to improve your edge against the house: hole carding, next carding, front loading, basing, peeking, flashing, warps, edge sorting, side-bets, shuffle tracking, ace location, new games, dealer tells, casino promotions, coupons, comps, and loss rebates!