No, it's not just you, Mr. Reviewer.
I won't pay for the United version, but as Trackmania Nations Forever is essentially the same game, although stripped, but even better as it costs nothing. I'll offer my thoughts on it.
TMNF is probably the most frustrating game I know. Either your brains will explode because you just hit the wall in the last corner after a perfect run, or your good time is bested by a freaking millisecond in the last possible moment making you want to smash things. I could see people becoming hulks after playing it. Also, your wrist will NOT thank you for downloading the game. Essentially, it's a four button fest, making long play sessions relatively painful for your fingers.
But to the plus sides, eh? It's quite fun, because it's easy to learn, yet hard to master. Feels good seeing your car in the first spot when the track ends. Also, it's free. A reason good enough to try any game. Although I found it far more entertaining in the past when the original TMN was released - most people were complete noobs then, there were a lot of players and it was easy to get the top times - it's fun now, too. There are a lot of servers to play on with heaps of custom tracks - you will never play through all of them.
If you haven't tested it yet, go download it. It's worth the try. Gain points and make your nation proud.