According to ESRB, this game contains: Animated Blood, Animated Violence
Parents shouldn't have too many issues with the game. There's killing en masse in this game, but none of it is overly gory or exploitative.
Having a partner or two is also a requirement to fully enjoy this rare cooperative gem. One-player mode will grow difficult and repetitive quickly, but having a partner or two (or even three) will bring another dimension to the game as you and your teammates slowly work out team tactics and strategies.
It's quite a rewarding experience too once your band develops some semblance of gestalt. Gauntlet Legends should appease old-school fans and action fans new to the franchise alike. But those looking for a true role-playing game experience should stay away from this one because it is still, for the most part, a pure-action staple.
The Nintendo 64 version, despite its age, is a solid port with high-quality graphics and four-player mode.
The PlayStation version is a competent port, but it lacks the four-player mode limiting players to two-player action.
The Dreamcast version is the best of the bunch. It sports arcade quality graphics, has four-player support by default and all the sounds and gameplay to go with it.