I agree Ttich.
Roulette is more luck.
Blackjack involves making decisions based on the odds. If the cards are against you, you will still lose. But if the cards are neutral, you will win if you make the right decisions.
The reason most people lose, is because they get too hung up on getting close to 21. You are not playing to get close to 21 ... you are playing to be higher than the Dealer, without busting. The trick is knowing when to Stand with a low number, if the Dealer is statistically likely to Bust.