It sounds ok but the reload at the start sounds clunky as hell. It'll slow the whole thing down. If the ability insta-supresses all squads in the arc then it'd be worth it.
Keep in mind that the vet 1 on the MG42 and 34 both require a reload before they start. This helps prevent them from switching to AP and instantly wiping the unit in the arc. It also forces a little fore sight.
If an ability like this was triggered the suppression would be extremely high, it would basically force instant suppression and rapid pins. However, you wouldn't be very effective vs. another MG because you would need to reload under fire, and you would lose DPS so the other MG could just wait it out if you had sufficient cover. The goal here is to build out the MG's function without making it work independently of other units.