Something you should look out for is if their level is pulsating yellow, it's so you can tell if you can play more aggressive or expect them to pop their super in panic or to take down your team quickly. I've been using grenades what can target or pulsate so you can stop them charging you or if they are camping around a corner. Warlocks are lucky to be able to make their grenades burn so you can tell if they are running away to get to safety or still waiting there. I won't say "git gud" just use your arsenal to your advantage. And play safe. Once they get too used to you playing safe play aggressive and catch them off guard. Take care.