I just got to join an online 5e D&D game when quarantine started. Normally I DM and only get to play at convention events, so this was my first home game of D&D in over three years.
I tend to be a picky player. I have a very fast paced style of high adventure (or at least, interesting things happening). Not true in other campaigns. Most recently we had multiple sessions of gathering mundane supplies and trekking across the wilderness, rolling mostly weather events and roleplaying our watch rotations. Then we got to the "dungeon" that had one easily avoidable trap, two easy combat encounters, and a negotiation.
So it's hard to find a group that fits my style where I can also play. The system seems "okay."
My complaint is that, even when I'm DMing, there's not enough interesting things to do in combats that go on more than a couple rounds. I was running a climactic fight recently and my fiancee had a 9th level fighter. A few rounds into it, she had already used her action surge and second wind. Her brother (playing the rogue) was doing the same thing every round: reaction for half damage, attack and try to get sneak attack.
While casters get more options through spells, martial classes are not only not powerful enough but they're boring. At the very least, I think martial abilities that recharge on a short rest should have a recharge die mechanic (similar to the dragon's breath weapon).
I would only play a 5e martial class in a one shot.