One of the great things about LoL is the endless possibility for expansion. There can always be new heroes, new maps, new game modes, etc. Those things need to fit well into the game to really serve as expanded material, though. If no one’s playing those modes/champions, they have virtually zero effect on the game.
That’s exactly what I’ve been seeing in the new champions. They get played for their launch week and the subsequent free week and then fall completely off the radar. I almost never see Olaf in game any more, and when I do I tend to smash him. Malzahar? Never. Akali? Less than never. Garen? Rarely. Kennen? Nope. Mordekaiser? Occasionally. The only patched champions I see on a regular basis are Shen (who is in nearly every game), Ezreal (same, almost every game), and Pantheon (only because Heartseeker is crazy broken right now).
If you take a look at the champion list at LoL Base, you’ll see that the only one of the champions I never see that has a positive win/loss ratio is Mordekaiser. The rest are negative, in some cases drastically so, which says to me a couple things. First, and most obviously, those characters suffer from some kind of serious design flaw. Though I think several of the champions I mentioned are solid (Kennen and Garen for the most part), the others have trouble providing serious support to a team. It could be that players just haven’t figured out how to play these new champions, but most of them are old enough that someone, somewhere should be playing them or singing their praises, and that’s not really the case.
It’s too early to say where Kog’Maw will fall, but if he follows the current trend, we’ll see him for two weeks and not much more.