The only issue I have with it is the so-called Kobold Karousel, where many monsters all run past and attack from the same space.
And that TBH is more an issue with the way initiative and 'taking turns' works in the game.
1. Everybody has Spring Attack. You can run in to melee, stab a guy, and then run BACK around the corner, out of range and next to the Defender. Even the wizard can "Spring Burning Hands" to line up a shot and then retreat to safety. Worse, if the PCs have formed a choke-point, enemies can use this tactic against them by having each monster run up, make an attack, then run away, clearing the square for a new monster.
2. Ranged attackers in melee can move back, shoot, then move UP to re-form the line (notably for our laser-cleric who picked up a shield and is now a decent front-liner). Taking disadvantage for making a ranged attack never happens unless you are truly pinned.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.