To be honest, I have not played a single great DK stage in the Smash Bros. series at all and 75m is no different.
75m suffers from mostly the same problems from New Pork City. If you are one side of the stage and your opponent goes to the other side, the camera would randomly cut you off for no reason whatsoever. The camera was an overall complete mess in this stage.
Another major problem with this stage I had was that, every-time you could do your recovery/Up B move near the ladders, you have yourself locked on to the ladders and you would have yourself locked on to the ladders, until you finished climbing it. I don't think you could even get yourself jumped off the ladders. (I rarely if ever play this stage) This is completely unfair as your opponent could come next to you and do a cheap combo move while you were climbing the ladder and/or you could also get yourself accidentally hit by the moving fireballs that move all around in the stage.
Making matters worse, the platforms in this stage are extremely small. Even small characters like Kirby nearly take up the entire area for one platform.
The fireballs that move during this stage are annoying and hard to dodge as, the fireballs move extremely fast on this stage and it's easy for your opponents to do a cheap move combo on you smacking you into the fireballs as the fireballs can do a good chunk of damage to you.
On the positive side for 75m, is that at least it looks decent. It's look extremely like the classic DK arcade version stage and the music isn't half bad on this stage.
For 4 stages in a row for this countdown, the gameplay is hardly seen as fun in these stages and the only positive thing about the bottom 4 stages in the countdown is the animation. I am going to let you guys on a secret... Once I get done with Numbers # 31 to Numbers #26 in the countdown, the stages go from bad to okay. Stay tune in the countdown.