I always liked the NX-01 design. But to me, forever and always, it will be an upside-down akira class ship. TBH, before I first saw Enterprise, I imagined the ship would look like some kind of rocket ship, kind of like what Galaxy Quest had done. Either that or some kind of blocky, technologically mish-mashed freighter.
I remember when the design was first released to the public in some TV Guide piece, it looked a little different. I remember as a kid going, "That's it?" I thought it was kind of simply. I expected the large and grand generational-kind-of-ship, given how they were presenting Ensign Mayweather as being a space boomer and all.
Personally, I was expecting something a little different than what had come before. Instead, we got a TNG ship with a pre-TOS wallpaper. (Which is kind of ironic considering the TNG sets are TOS Movie sets with TNG wallpaper.....lol)