Diablo – Are follower items worth keeping if I never play solo

There are a few Barbarian skills that charge at enemies and generate fury which should be used often. Leap is one you gain fairly early on, and you can even use it to jump up and down ledges or across chasms where other classes have to run around. You should generally be running ahead of players rather than lagging behind.

Also remember that you can build up Fury just by attacking things like crates. Keep your fury high even without any enemies around so that you're ready to go when you do find something to kill.

Barbarians (and Monks) get a passive 30% damage resistance to make up for their melee natures, and tend to have higher vitality and health than the other classes. Against many enemies, it is the right thing to do to just jump in and start causing havoc. Barbarians are good at distracting enemies while their teammates do damage, so try to focus on that rather than claiming the final blow. You get full experience and drops whether you're the one landing the finishing hit or not.

In general, I completely ignore whites and grays - typically they're worth less than 10 gold a piece, which is not even worth dragging back to town. Do note that some "special" objects such as health potions and gems have white text, which might be confusing if you're completely ignoring that font color categorically.

In the very early going, when you have equipment slots that are completely empty, they're worth grabbing just so you're not completely naked. In particular, when you're just starting out, keep an eye out for a Targe shield - it's got typically around 50 defense, which outclasses most of the defense you'll find on any other item at this stage of the game.

In the very early phase of the game, you can occasionally find a white weapon/armor piece that has slightly better DPS than your current weapon - I've found white weapons better than blues I had from previous dungeons in the early levels previously. For this reason, sometimes I'll grab (or do a quick check by hovering over it and pressing CTRL, as bwarner notes) the first white item of a type I find, just to see if it's a class better than my current gear.

Past about level 5 or so, though, you're better off leaving them where they drop. Once you have items that give you beneficial stat boosts beyond the basic defense/DPS rating of the item, whites and grays are almost always going to be worthless to you. Even if you can get a few extra DPS or defense points out of a "higher tier" white, it probably won't offset the utility of the other bonuses on your current gear.