When done right, it can help make you care about specific characters (Bioware), and when done wrong you at least still get another target for your enemies to attack (Bethesda). Unfortunately, when done very wrong it tends to lead to murderous rampages and the throwing of game discs out of windows (any escort quest ever).
Some games really couldn't do without them though, so it's wrong to say we would be better off getting rid of them altogether. It would be boring if you were an unstoppable one man army capable of accomplishing anything without assistance in every game.
Some games really couldn't do without them though, so it's wrong to say we would be better off getting rid of them altogether. It would be boring if you were an unstoppable one man army capable of accomplishing anything without assistance in every game.