-Diversity of environments is poor. DKC2 had some fascinating and unique levels like honeycomb hives, amusement parks, dungeons, swamps, pirate ships, "lost worlds" (remember that giant bouncing tire level? That was so cool) etc. This one just has forest, more forest, a burning savannah, a juice factory in a forest, a few underwater levels, and some ice levels over a forest.
Could not disagree more. Every level in Tropical Freeze has an impressive amount of unique assets exclusive to it all-around. Simply going by the logic of world themes does not even remotely do justice to the level designs.
Visuals and platform elements are used in one level and never seen again, like hot-air balloons or tornadoes or an avalanche. And everything is impressively vibrant and animated. The production values of the levels could be the most excellent of any 2D platformer of all time, honestly. There is a lot of diversity and it's remarkably dense.
Also, DK Island's levels were the all world themes from DKCR, but frozen over, each given a level. It was much more than just a jungle.
[Insert an "[Insert witty saying or joke]" sig here]
Or you're argument is just incredibly uncompelling, thus rebuking is unnecessary.
Donkey Kong Country 2 is a remarkable game and has been my favorite platformer of all time until Tropical Freeze. They're both remarkable games, and I only very slightly prefer Tropical Freeze. They're vastly different experiences too, which makes your specified arguments all the more odd and less valid.