Hey, i just beat the game with version V3.0 and i'll write my opinion about some missions i had trouble with if that's okay. Note - the slingshot helped me alot in this mod.
Chapter 1 wasn't really hard, i don't remember having any problems, not even with Russel.
Chapter 2 was harder, but still not that terrible, no problems or fails until the two last missions Boxing challenge and Dishonorable fight. Both were really hard and i had to use a lot of tactics. The only way i was able to beat Bif was to hurt him and then wait for the timer to run out. After that it took me about 10 tries to figure out a tactic to beat Derby. Beat the first three preps, get a soda, walk into the room, block the doors, after that run around shooting the two remaining preps with a slingshot. After they're down i had to carefully and tactically beat up Derby.
Chapter 3 - Bait, i failed about 4 times. Fighting Johnny Vincent - took me about 12 times to figure out a tactic to beat him - get to a wall and have a spraycan ready. Keep spamming the overhead punch move and after the fourth punch don't finish the move yet, only after he's sitting by the wall and then use it to give him an additional punch to the ground. When he's on the ground kick him. Repeat and if anything goes wrong, spray him in the face. Using this tactic, i got knocked out only like, 5 times
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Chapter 4 - Defender of the castle, failed twice. Nice outfit - Didn't fail on this one, but it took really long for me to knock out the mascot. Jock boss fight - I was surprised because when i read the description the maker, c00ld0c26 said it was "super ultra hardcore , Nearly impossible! , this one took me 19 tries!" For me the mission wasn't hard, i passed it on the first try but it took a reeeeeeeally long time to pass.
Chapter 5 - Not really that hard except the last four missions. Bustin in part II - I used the slingshot the entire time. The first part of the Edgar boss fight wasn't easy and he took quite a bit of my health. The second part was easier, because all i had to do was keep attacking him and then pressing R to knock him down. Complete mayhem - I cheated a little on this one
To beat Derby i had to take the giant pipe used to fight Edgar and keep hitting him with it until he's down. The other two preps and greasers,jocks,nerds were no problem. Final showdown - This mission left me with the biggest surprise of the whole game. From the description of the mod i was expecting a really hard fight that would cost me a lot of nerve but that wasn't the case. Gary was even easier than without the mod. He didn't hit me once and i literally beat him in about 20 seconds, i didn't even manage to recover and the credits were rolling.
Sorry for any spelling mistakes and for making it so long, congrats if you actually read the whole thing.