Granted, Sonic isnt Castlevania. But the point applies. people used to ENJOY getting their asses handed to them in games, because it made you want to play till you got through the section. The ragequits and all were just part of the experience. Now, one death and people complain the game is flawed, or is too hard. they blame level design, game mechanics, controls, camera, the developers, whatever- Whatever happened to trial and error in videogames?
As a guy who loves the likes of "hard-boiled" games like the Rockman Zero series, Viewtiful Joe, God Hand, Earth Defense Force, so many NES classics and even more recently with Bayonetta, I am no stranger to games that pit my abilities to the test.
My only thing? The game needs to deliver on its end, as well. Controls need to be tight. Camera needs to work with me, and not against me. Level/Enemy design should offer a bonafide challenge, without being "cheap". The game mechanics need to all work together for good, such that if/when "death" happens, it's nothing more than MY BAD. I can respect a game that has a propensity to beat my ass 7 ways til Sunday, provided it's done more to be well-made.
THAT is not something that all Sonic games, especially those made in the last decade, can claim. They're NOT well-made games. A number of the errors that have even plagued more recent entrants like Black Knight and Unleashed, have been aspects that have been plauged 3D Sonic games since Adventure. Camera controls, hit detection, level design/enemy placement and then of course....physics.
http://www.youtube.com/watch?v=ze582VGaAkY&playnext_from=TL&videos=8d6QuyHoLoESome thing like the above draws attention to a very thing that has plagued the majority of Sonic games made in the last few years. They're not even trying to make anything close to "momentum-based" speed game play, any more. It's all event-based triggers now. That's why Sonic can just go for a "stroll" in 06/The Fresh One, as you saw demonstrated, and do the "Spider-Hog" act in the Rushes and this leaked footage of Sonic 4 (gifs posted pages ago).
If Sonic Team and Dimps just want to do more to make Sonic into speed-run based "thrill rides" from here on in, they could at least make sure that their games are well made in that area. But they don't even do that much!