Lol, you're missing the whole point of word "variety". In NFS:MW you technically have 3 different themes. City downtown, city central and suburbs. And a highway part if you want. In Split Second you have:
Airport Terminal
City downtown
Power plant
Dry docks
Construction yard
Airplane graveyard
And i probably forgot few completely different tracks. Some parts of tracks are shared between them like in NFS3. The same as we could talk about variety in NFS3 and NFS5. You had a small town with countryside track, then you could drive a similar track with snowy theme, a desert track, high tech city Atlantica and Aquatica that is very similar, only that you also go beyond the city to the seaside cliffs. Green and twisted Rocky Pass track with high elevation changes, dark Empire City and extreme The Summit. Or tracks in NFS5 like Corsica, Monaco, Alps, Normandie etc... That's variety. Something you cannot ever achieve in open world. Unless you make a freak of everything track which no one made so far.
As for the exploding everything in front of you, you're again missing the whole point of the game.
The game is presented as TV show. You even have Seasons for each segment of the game.
Tracks are designed to blow up for the show, explosives are planted everywhere. That's the point of the game. Maybe there is a commentator missing while driving but then again, it could get annoying if there was one. As for the music, it's there but it doesn't stand out in any way.
But then again i hate EA Trax shit. Some tracks are good but most are just stupid commercial crap.
I want my pre EA Trax music from NFS's back. I don't get it why they aren't working with Romolo di Prisco anymore. He's the real mastermind of racing music. The menu music from NFS3 still makes my skin crawl every time i hear it. Generic usual music cannot ever be better than music specifically made for the game. It just can't. Anyway, the music could be better but it's not annoying either. It's more in the background anyway as they push destruction sounds more in the front.