Agree to disagree, yeah I'm cool with that, but at least in the MD games you have to gi looking for glitches; Sonic Adventure glitches to the point where you'd think it was a selling point on the back of the box.
Um I encountered plenty of glitches in the MD games.
In Sonic 2, it is easy to be wedged between boxes or walls due to a glitch in the physics.
Also if you trigger super sonic when you pass the sign, it will freeze the game making you reset.
The frame rate also shutters regularly.
Sonic 3&K, landings regularly don't register after jumping causing death (especially in the rolling tubes in Flying Battery).
Frame rate regularly stutters when too much happens on screen including losing too many rings.
Doomsday zone has the noticeable slowdown when you hit asteroids.
Blue sphere stages don't always recognize your input (which was ported into Sonic Mania)
Still has the super/hyper sonic glitch at the sign
Sonic 1 has glitches due to the physics engine not responding correctly.
Also frame rate issues
Jumping issues
Many of the glitches derive from Sonic 1 and 2 due to all the games using the same engine.
Sonic CD has plenty of its own issues, such as loading issues (especially when time travel is triggered)
You can get stuck in walls due time traveling altering the stage.
It still has the blasted jumping issues.
Though to be fair, Sega ordered it to market before the team was done.
Sonic Team was told unexpectedly that the Dreamcast launch was moved up and to stop development of the game and to have it ready to ship for the launch.
They only had less than 6 months from when they were told to stop and to release.
There wasn't time to debug the game.
Sonic Adventure 2 development was cut short due to Sega having financial issues.
Sonic Heroes didn't have time to be fully debugged, to meet the holiday release.
Sonic 06 was pushed forward by Sega's management, which is why the game was horrible. If they gave them more time, it probably would have been better.
Sonic & the secret rings was pushed forward as well to meet the launch window of Wii.
Sonic and the black knight supposedly only had a year in development.
Sonic generation was given a full 3 years in oven, but still had a strict deadline.
Sonic lost world was rushed... but it was still decent.
Sonic Forces was given a full development cycle supposedly 4 years in development.
That's the 3D games.
Sonic 1 had 2 years in development (which was more than enough for 2D games)
Sonic 2 had 1.5 years in development and management refused to give the team a delay.
Sonic 3 & K was supposed to be one game for Christmas 1994. But due to expense of the cartridge required and management wanting the next game sooner.
So management ordered the game to be broken into 2, so a game could meet a Christmas release for 1993. So they were unable to debug in time so it was delayed to February 1994 and debugging was cut short to meet the release date.
S&K was "completed" for Christmas 1994... management refused to delay it.
See the trend?