I just tried the mod out, 100% it. Here's my criticism.
The dialogue is funny
I like the plot of Smithers taking over Krusty's business
The challenge missions are fun
The card locations are different from the vanilla game
Some missions are a flat out copy of the vanilla game's missions
The later missions are essentially "Destroy the Truck" or "Kick the Person" and that gets really stale very fast
The gags, Wasp Cameras, and traffic vehicles are all vanilla
Why doesn't the Golden Open Wheel Race car have car noises or a horn?
The bonus mission is way too easy
No outfits? I wanted to see a "Mountain Dew" shirt for Homer.
The Collector Card quotes are still vanilla and haven't been removed
No new secret vehicle
It's an okay mod. The main missions needs some improving, and the collectables should be in different spots than the vanilla game. I really enjoyed the dialogue and plot of the mod.