Heavy Weapons versus Rifles-
When I first started I chose the heavy weapon variant. I had some fun slogging through levels, laying wast to enemies. I tried out every variant of heavy weapon and though they were awesome.
Then I decided to try out the various Rifles, and man I feel disappointed. All the Rifles are nearly on Par with Heavy weapons as far as damage goes (With the exception of the Heavy Flamer, That thing is great) but Heavy weapons keep the character slowed, which makes maps take longer. Currently there is no advantage to the heavy weapons, and their main disadvantage is a major disadvantage. The Rifles feel good where they are.

Suggestions: Remove the Slower speed from Heavy Weapons but have a 2 second bracing before fire can begin. Buff Heavy Weapons Damage, either from fire rate, damage per hit, or both.

Cover-

I know there's lots of posts on this but here's my feedback. It feels Clunky and extra. I would suggest it being toggle based with a specific key to order the character to go and take cover. Something like press V to have the character head to the spot and then take cover. Obviously canceled by a Move command.

Extra-
The Range of weapons feels short for these being Rifles and heavy weapons. The distance seems more appropriate to pistols. Can we get a buff on Range?