League's Ranking MMR broken?

I'm a little puzzled. I've been trying grind out some ranked games and something has been really getting on my nerves.

I ended up going 4/6 on my provisional's and ended up in Silver III. A little heartbreaking but still i was down for the grind to climb.

But what really upsets me is that even though i'm in Silver, i'm being matched up against Platinum players?? My games have always consisted of one of these scenarios:

1. One team consists of at least one Plat, 2 Golds on the opposite side, and the rest are filled with Silvers.
2. One team consists of all Gold players, and the opposing side at least 2 Plat's.
3. All teams consist of Plat players except for me, and another Silver on the opposing.

Now, I'm not upset that i'm stuck grinding in Silver due to a poor provisional's series, but what the F?? Riot, can you please explain to me why you're going to stick me in Silver but match me with Plat players?? It makes climbing the ladder really tough. Please fix this.