Positive,they help mental health alot.I assume the reason why people think video games are a negative is because of shooters being the famous i guess?
There are countless genres which are relaxing,some i have in mind that would be helpful if you want to know history,lore and they mostly are for relaxing and roleplaying such as CRPGS(Dragon age,Mass Effect,Elder Scrolls,Baldur's gate) or strategy(age of empires,civillization) though i have mostly in mind the paradox ones that help you with history or lore if you play any submods (Crusader kings,Europa universalis,Hearts of Iron)
Though what Amerie said is truth since they can also be an unhealthy addiction,some people on sports games spend hundreds of dollars just to have a better player/team(what comes to mind is myplayer in 2k and ultimate team from FIFA)
I guess its just what you mainly play and how you play it that changes your perspective,games are way too diverse to make a general opinion on them.