Sounds like somebody doesn't know how to the play the game.
I think that's going around.
The game gives you so many tactical options you can use that it really does take time to get comfortable with all of them enough so that you can be flexible while using the right tools for the job.
At any given moment you have:
* A quiet melee killing blow.
* Your primary weapon, many with two fire modes.
* Your secondary weapon, many with two fire modes.
* Grenades, EMP or tripwire explosives.
* Adrenaline which not only heals but pulls a Max Payne whenever you aim during the sights while under the effect.
* A tactical echo that shows you items, cameras, weapon racks, enemies and hackable systems, through walls, for a decent duration.
* An attack drone that can either attack enemies directly or hold an area aggressively. You can use it to scout ahead, cover your rear or flank, or engage enemies while you flank or fall back or reposition.
* A stun drone that can flashbang/EMP an area. You can use this to temporarily disable heavy walkers, strip enemy shields, or to give you more time to take precision shots when you're worried about civilians. Need to experiment to see whether it can act as a decoy lure to draw the enemy to a particular area.
* A shield drone that can provide you a one way firing platform. Good for many uses but especially counter sniping, or lining up rocket shots against aggro'd armor.
* A zipline that can move you to most areas as long as their lower than your current position. Knowing this you can take the high ground when starting an attack and quickly get your ass out of dodge and attack from another angle. You can also fire while zip-lining or drop into melee.
* Your basic shooter move-set including crouch, sprint, jump, taking cover and mantling over cover.
That's a lot of tactical possibilities at your fingertips, and all of them with short cool-downs. Smoothly shifting between those abilities and taking full advantage of them depending upon the situation takes some real practice. I'd imagine many players fumbling through a lot of the game's scenarios.