depends on how it's done. I have 2 18" tubes in my engine bay hooked to a mercury switch so when you open the hood they turn on, 1 10" under each side of the dash to light the front floor, one 10" under each seat to light the back floor up, those four connected to the door dome light and I have a 3 highpower blue LED's instead of a regular bulb for my dome light. I have a 36" in the trunk hooked up to the trunk light(with the bulb removed of course) and I have 48"ers on both sides under the body tucked up next to the oem skirts, a 36" under the rear bumper, and another 36" in nose under the radiator. Out of all of those the only ones you can actually see directly are the ones under the hood, they are there to light the engine up if I need it.
So is neon lame to me? helllll no. I love it. It just has to be done tastefully.
I have the underbody wired to the dome light(when I disarm my alarm at night my car glows inside and out) and I have a tap with a diode to a switch so I can turn them on at night if I feel(the diode is so when I turn the underbody on with teh switch it doesn't turn my interior neon on.
The key to a good neon setup is making it so you can't see them. If you can see the tubes then you are lame lol...