While the second game in your screenshot is arguably applicable, I would debate about your complaints with the first one shown. Your KDA is generally better than your teammates, but that's not all there is to the game. For example, your Gangplank died 2 more times than you, had no kills, BUT he had more assists and noticeably more cs, resulting in him actually contributing noticeably more gold to your team than you did.
At a glance it may seem like to you that your teammates are less skilled than you, but if you objectively take in all factors into account I'd wager 1 or 2 of your teammates are most likely at your own skill level based on these games. The rest may indeed be worse, but I'm doubtful all 4.