I always play with Sonic, for many reasons, and from v2.1 until today it is something that has helped me to be much better in the game (not including the fact of playing with Mouse) but I always go fast in Arid Canyon, until I arrive to that part, it is very unenjoyable and honestly, I think that despite not being very difficult, it does not feel fun.I find that SRB2 v2.2 generally does a good job at not being frustrating. There's a big difference between challenging and frustrating and SRB2 usually is firmly in the former category. However, the rope pulley gauntlet at the end of Arid Canyon Act 1 is the definition of frustrating
I think that a frustating moment in SRB2 for me is when in CEZ 3 BOSS make you Lost lives or provocates Game over
Is too frustating
The boss of Castle Eggman Zone is soooo daaang difficult. I got stuck on the boss's second phase of flying around with the tripod of maces because I thought I had to attack him by hitting him directly after bouncing of the spring, not realising that I could reach him by running along the arena's wall.
This boss was the end of many of my runs, even with custom characters, unfortunately on No Save.
The good thing about Knuckles' Azure Temple path is that you can skip it using the bubble shield's bounce ability, letting him take everyone else's path instead. That's what I always do, because Knuckles' path in that level simply isn't fun.This applies to 2.2 only, as I didn't play 2.1 too much and 2.0 even less.
The base game itself wasn't too difficult for me and was overall a fun time (even did an all emeralds file with all 6 base characters.) It started to get a bit more tedious when the extra levels came around to me and Azure Temple showed up, but ATZ within itself isn't too agonizing until you play Knuckles. Knux path in ATZ is probably the most irritating thing I've experienced in vanilla (yes, even worse than Fang emblem/"Knux path" in Aerial Garden.) Nowhere else in SRB2 have I found myself genuinely frustrated to a marginal degree, and I can't stress that enough. It's so bad that to this day I still haven't beaten it legit without a super form or something extra. Highly recommend getting a good grasp on how Knux plays before you try ATZ with him.
Azure Temple itself isn't that fun to begin with. Me and my friends were stuck on the stage for an hour in Multi wen I decided to play it.The good thing about Knuckles' Azure Temple path is that you can skip it using the bubble shield's bounce ability, letting him take everyone else's path instead. That's what I always do, because Knuckles' path in that level simply isn't fun.