I was trying UU/DD a lot in the beginning but eh. Not trying to bitch but to me it feels a bit stiff.
No? It feels like Streets Of Rage. The fan-made SoRR is where they changed up shit so maybe you're too used to that?
If you want something that feels more akin to SoRR, go check out Fight N'Rage. It should be required if you like beat-em-ups. 
I feel like the fan made Streets of Rage Remake isn't so much 'mixed up', as it just takes the best from all three games and combines them. It also gives you options, so I think you can even turn a lot of stuff off or even change it to be from a different SoR. The only thing that's changed there is you can do a super move like in this game, on a cooldown and you can run/roll up down. Oh yeah and it has multiple paths.
I also been playing SoR2 on 3DS, and while it's a great game I still miss not being able to run or dodge roll. It just makes the combat and movement more fun in my opinion.
It also doesn't feel like SoR because I can't play with a D-pad because it doesn't allow me to walk diagonally though im not sure if thats on my controller/setup or a quirk in the game. You can use the analog stick to walk diagonally.
I have fighting Rage and I do think that's a great game, although I'm not too big a fan of the artstyle where you're just beating up criminal looking animals.