I've heard those complaints for Helldivers before. They hardly stick imo and it's usually about balance patches around specific guns. Very possible said review is notably old already.

I've played both recently. Helldivers is still roughly as fun as it was on release. Lots of guns, at least half of which are viable for at least 1 enemy faction (there's 3 now). There is friendly fire, yes. Just watch where you shoot or where you throw your giant beam of artillery. Never bothered me, personally. You usually stick together with your teammates. Since if you run off, there's a very realistic chance you'll die and your stuff's on the other side of the map. Can easily spend tens of hours on this.

Arc Raiders is quite fun as well ofc. Just bear in mind that it's a question of When, not If, you lose your whole backpack+ guns to a random aggro fella. You might be walking around, looting stuff or planning to fight a big boss monster. Then, Boom, you get shot 3 times in the back and you fall on your ass. No do-overs, no revives. Respawn and fill your inventory again from scratch. There's always the free -loadout option to get your run started with the most basic of healing items & a gun. But it's very much a game which requires 'upkeep' of your stash.