I want to ask something, completing Professional MM2 is so difficult (I have only completed Amateur and use save game). Then how will anyone finish your and NotoriousA's racepacks with default cars. (I include your other racepacks also). And is finishing MM1 races possible?
Yeah, MM2's professional races are not easy initially. It really takes some time to have a strong grip on this game. You may find professional hard, you can definitely try NotoriousA's Intermediate Difficulty Racemod, it a level between Professional and Intermediate.
Playing Intermediate then professional will gradually improve skill. At the end you will even find Ultimate difficulty quite dumb.
It is actually interesting to play hard and new races. It gives nice feeling. Ofcourse losing again and again may annoy the player so much, but when you finally win, you feel like a God.
Anyone can definitely complete the racepack. We really pay attention to not make races entirely impossible. Sometimes, we deliberately leave some loopholes in our races which you'd notice after you actually play the racepack.
For MM1 default races, really they are not so hard. It's just traffic (and cops in some races) which makes them hard. A lot of races are so easy that they can be done by even City Bus.
The best way to win professional races is by not letting your opponents win. In MM1 you can just slip, slow and crash everyone out. Even Crosstown Switchback, Frosty Finale can be done by the City bus if you just crash the opponents
Amateur version is hell so easy.
You know, the Angel studios intentionally decreased acceleration of many opponents to 10-20% in many races. The Loop De Loop in amateur (which has all Panoz roadster) is beatable by Fastback due to this reason.
For MM1 CGE races, only the last 3-4 checkpoint races are pain. But, they have weaknesses too. You can actually do last three races of CGE by City Bus because it is easy to crash all the opponents in them. This is one of the crazy ways to win any race in MM1. I'm sure Microsoft put City Bus in game for this reason
Circuit races are definitely not too hard, except the last one.
Just play, play and play, you definitely master the game. If you develop habit by driving with mouse and perfect it, racing is a piece of cake.