"The community seems very strong at this early point and should really take off in June."
Well, the TrackMania online community already took off back in 2003 and it's been strenghtening and growing ever since.
"...there are already over 1000 user-created tracks already online."
That "over 1000" tracks part is not true. It's more like over 10,000 tracks total so far when tracks of all the different sites are put together.
The best tracks site (with world records etc.) is TrackMania Exchange
http://www.tm-exchange.com, very well done site. Highly recommended.
Btw, nice review. The value score (10) is especially true