I play in a group with two rookies and two long-time gamers. The rookie perspective: when your turn comes up, you must do something, NOW NOW NOW, valued only in terms of its immediate outcome. Preferably an attack.
If the rookies had plasma cannons, which took one turn's Action to charge, and then on the following round could be fired for an AOE Line, 20', DC 20 DEX save, 20d6 damage; then they would still use melee weapons, because they would not have the patience to spend a turn on the charge-up. It's all about I WANNA HIT SOMETHING NOW NOW NOW, not about winning with minimal losses.
Veteran tactics include surrounding a foe's hiding spot with oil puddles and caltrops, then use smoke to force them from cover, and ignite the oil as they cross the puddle.
I wish the rookies were ready to ready the Ready action. Right now they're way too eager to do anything which doesn't bear fruit before the next person's turn comes up. No deferred gratification.