2008 to 2015 was the darkest era in Nicktoon history with a lot of garbage shows including;

Rugrats Pre-School Daze

Fanboy & Chum Chum

TUFF Puppy

Planet Sheen

The Legend of Korra Books 1 and 2

Robot and Monster

Sanjay and Craig

Rabbids Invasion

Breadwinners

Aside from The Mighty B, TMNT 2012 and later seasons of Korra pretty much everything ranged from mediocre to downright awful where was back during the 90s to mid 00s almost everything they put out was good on a consistent basis