Raph has average speed and range at best and is extremely linear and is mostly comprised of highs making him predictable.
Who are you comparing to ? Alpha Pat is in a class of his own. I agree. DNS B? I'd say he's up there, especially at the i12 (6BB) i16 (3B) and i20 (236B) thresholds. The thing is that each of those moves are "pseudo" safe even if you mis-time your attack and it is blocked in that there is a probability you out-think your opponent with prep entries for the first 2 and FC set ups with the last one.
All of Prep's "dodges" are slow and fall prey to TCing moves. Or 2A.
SE is really strong against 2A due to the pushback off a blocked 3(B)~prep (basically anything outside of kiss-range), and a SE B is guaranateed because they don't recover from the whiff in time. I'd say 2A is not really a bother. It is the TC moves that cannot be impacted by prep4 AND are generally faster than prepK that shut down prep hard (best example is bullrush, but I also hate Viola's 8A+B). Nonetheless entering prep on block other than 3(B)~ and 66(B)~ seems to be really risky and should not be spammed.
You Weakness Is Left. All Of These Move You Can Step Left. All Of Them. By Stepping Left.
The sad thing is that prepK only tracks at his foot and not his leg, so if the opponent is close enough he can easily step prepK either side. At the tip of prepK it is pretty reliable step killer actually (so make sure you gauge your positioning and distancing properly so you're not out of range nor in the step-able deadzone) so anytime you're entering prep at +frames you'll CH side step attempts if spaced properly. That will take you experience and time to get the right feel.
Raphael vs. Viola. Lower tier character goes up against the highest tier character in a tournament match. This throws tiers out of the window for me, because he was able to keep up with Viola. They both knew what they were doing.
While it is a good video, the whole point of tiers is that there is a tangible difference at the highest level of play. Consistency is actually improves the tier rating, and I don't see a lot of Raph in grand finals. If anything, its the mid-level of play that tier theory is less strong because there are other factors (character/matchup ignorance imo being a key difference maker in this skill bracket).
Side note to other mid-level players: Personally I only prep (other than a guaranteed combo) is if I am CH fishing with prep BB BE or you have them to a wall and you can try prep K~CE setups knowing they'll try to step.
Otherwise, I just retreat to neutral frames or sparingly throw in a low-risk prepA once in a while to let them know that there is still a threat.
It is highly annoying to the opponent if you COULD continue prep pressure but instead choose to just backdash away and let them have to come to you.
Only do SE entries if you're certain the opponent will take a defensive position (ie you've locked them down mentally) and will either just hold guard or attempt to step. I noticed sometimes that other Raphs "hope" the opponent is frozen and transition to SE off a lot of prep entries which will backfire horribly against someone with experience against Raph. If you noticed your opponent likes to push buttons then continue with prepBB BE CH fishing instead, the risk is lower
prepB(B)~prepBB on hit only has 1 frame where the opponent can do anything (and they'll likely choose to crouch), so thats worth considering.
And please, just to mess with them, do at least one complete empty prep towards them. You can learn a lot from your opponent from how they react. While you can prep4, you are still invulnerable to all high moves for the entire prep duration until you can block. You will end up close to them and ALIGNED them to them more importantly. The good thing is that Raph still has decent tools up close due to having the standard 2A, one of the fastest CEs, a solid 6BB BE CH, and 8A+B.