Season 5 has just made it even more obvious that solo queue is decided on the jungle.
It doesn't matter how good you are doing in lane, how hard you are outplaying the enemy laner, and how well you know to trade. Whoever's jungle ganks bot first will win dragon and once you start getting dragons, unless you throw incredibly hard, you usually can continue to get dragons. Close match up mid? One early gank will screw you over completely. The most important object is dragon, and who has the most control over said important objective? Junglers. It's simple up to hoping that your jungler has better map awareness and uses his resources better than the enemy jungle. Count how many times you've won when you're jungle fed incredibly hard, got 0 objectives and afk farmed? I appreciate that the jungle class is getting attention from riot but it's just too much of a deciding factor for solo queue.