It's a shame. I actually liked the dark atmosphere that CD had (and Eggman's damn creepy Game Over laugh). And that in itself, is memorable. But the enemies and bouncers were so oddly placed. Literally running into them all time was frustrating. I'd say SEGA improved themselves from then in that regard.
Triple Trouble actually had very interesting concepts that could be brought back. The levels were shorter than Sonic 2 and 3 by comparison, but using item boxes that contained different abilities like speed boards and "pogo-stick" bouncers were fun to use coupled with simple, solid platforming. For whatever reason, i never went back to that game nor have I played it much, but i wish i did. What it did lack in, however, was sufficient speed. Most likely due to system limitations.
I just feel that despite CD being a cult classic, it really is overrated. The ability to travel through past, present and future was cool. Altering things that made a difference. But the layout was indefinitely cluttered. Triple Trouble should be getting more praise than it has, but it's been left to rot in the dust.