Riot matchmaking is terrible

Hey guys, so I just played a normal game. I wanted to have fun, maybe get my first win of the day. We lost the game pretty hard, and I thought I just got outplayed, blah blah blah. So after the game, I checked the profiles of the people in that game. To see if I really got "outplayed". So our team consisted of two Silver IV's, a Silver V, a Silver II, and an unranked. So pretty much around my rank. Now let's look at their team. two Silver IV's, a Gold II, a Platinum I and a Diamond V. Do you see anything particularly wrong with this? I mean, take a guess. No one on my team is even above silver, and they have a gold, plat and a diamond. HOW THE FUCK DOES THIS HAPPEN RIOT??? Why? Please fix your matchmaking Riot. I've been against a Diamond I before and even a masters player, and I've never been above gold.