I think single race is easier too, but only because it's less competitive. I've done some single races recently and easily obtained good scores, which have improved my rank a lot. So I can look at it and see that really, I'm not better than a lot of the people below me in the rankings who actually have barely done any single races at all. But if more people took part in singles and treated it as a legitimate game mode instead of shunning it, then it would be more competitive and wouldn't be so easy to get good points from it. I think it would be better to encourage each other to compete than make competing in it less worthwhile.

Multiplayer is a bit different, because it's heavily affected by the internet connection of the individual, and those he or she is racing against. I often feel like I'm at a disadvantage in terms of getting good records online because my ping is at least twice that of others. But at the end of the day, the more time I spend on multiplayer, the more chances I have of getting good times, so I don't mind if it's weighted equally either.