You're playing low level characters, they're not gonna have multiple attacks per turn at these levels. As per 5E rules, fighters get their first extra attack at lvl 5, and currently in this EA version characters are capped at 4. So good job, saying the game "isn't D&D" and then complaining about the game working according to D&D rules.
Multiclassing doesn't work because it hasn't been implemented yet. Because the game is, you know, not finished.
Overall your post is very whiny and not constructive. Do better.
