I actually agree with you.. Except my patience ran out after Undercover.
I'm going to go backwards here:
Undercover was a shitty game, with an awesome movie-like trailer. Sure, Maggie Q was a nice touch and all, but there was nothing going on for the game itself.
I played it on PC, the menu interface was horrendous. Depending on the submenu, you'd have to press ESC to go back, or press backspace. Terrible, terrible UI.
ProStreet was a complete mess. Even the menu screen was garbage. Felt like an incomplete game. I'm not even sure was there a world map in that game. Maybe there was? I don't know... I only lasted about 2 hours playing that awful game.
NFS Carbon was a pretty decent game. My memory's a bit fuzzy cause it's been so long. I can't remember did it have day time driving in that game, but none the less, it was not bad. The mountain pass racing was fun.
NFS Most Wanted, to me, this game was just ridiculously hard. TBH, I found the cop chasing a distraction, cause I couldn't really go all out with my car before getting 3 Rhinos and 2 chopters after me within a few minutes. I know the addition of police cars is the big feature about this game, but just not my personal cup of tea. Also, the game itself was pretty hard. I don't think I ended up beating this game. I was stuck on the 2nd or 3rd racer. Also those shortcut paths are bullshit, where the PC will always hit every single one in the higher levels, and one mistake and you're fucked, might as well restart. Not exactly what I would expect from an arcade racing game.
Underground 2, the first NFS game I played. And man, I could jizz in my pants playing that game again. In fact, I tried reinstalling it for old times' sake just 2 days ago. But for whatever reason, I can't get it to run on my current system. It's not even widescreen capable. And I'm

deep inside, cause it will truly be the best NFS game ever.
Even down to the UI, it was perfect. All the NFS games that came afterward sadly changed their UI.
For example, in NFSU 2, when you're choosing aftermarket rims, you can still see the entire car, therefore, you can see how the rims would look with the rest of your car.
In all the newer games, it zooms in, so all you can see is your fender and wheel, and you can't even rotate the view to get a preview shot of your entire car with the new rims. That's some backward innovation there. And that's not just for the rims, that's for every body part you're modding. It fucking zooms in so you can't even see a preview of the entire car with the modded part.
Music Tracks:
I personally like a lot of the tracks in NFSU2. But besides this, pressing the "T" key would change to the next track. Can you do that in any of the other games? NO. You can't. WTF.
Map:
NFSU2 has the best mountain passes. I can't remember how many times I would time attack on those mountain passes, muting the in-game music, and playing Initial D music in my WMP, and then alt tabbing back into the game. I think Carbon might have had some too, but I don't recall if the other games had any. I'm pretty damn sure ProStreet didn't, cause it didn't even have a world map.
Modding:
NFSU has so many things you can mod, and you can mod them all independently. It's not like the newer games where you get 3 full body kits to choose from. And most of them are pretty fucked up too, probably designed by the ricey-ist ricer in the EA development team. I chose to go stock bodykit most of the time, cause I didn't want 2 park benches on my trunk, with hood scoops and vents plastered all over my vehicle.
If they ever make NFSU3, I 'm not even sure should I be looking forward to it. Cause it will probably be a disaster.
Hey, maybe they might make a nice trailer for it at least.
//rant.