I feel like extra tank comps beat out extra assassin comps nearly every time
...And that's a good thing.
IMO teamfights are what this game is all about. So naturally champions with kits that are useful in a teamfight should have higher winrates than assassins do because it means that Riot isn't overloading them with too much of the power they specialize in: snowballing out of control before teamfight phase happens.
When an assassin does his job it's just disappointing. If teamfights happen at all it's a stomp with one side simply having more champions than the other. Usually it just results in a boring slow siege that nobody attempts to break because everyone knows that the first person to step up will 100% get deleted, probably before his teammates can even close the gap.
If this is what some boards users call a "tank meta" then we should have "tank meta" all the time. Teamfights actually happen right now and they can still swing the game depending on how you play them. That's the League of Legends I want to play.
By "extra tank" I mean where the jungler picks tank or mid picks Galio and top doesn't pick an assassin or marksman but a juggernaut instead. Any comp where there's more than one full tank. By "extra assassin" I mean when mid or top picks an assassin, and the jungler does too.