I love seeing the decorated doors, and it makes for good landmarks in the corridors, as in, there's that door with the really elaborate FE pockets, so I'm getting close to my room! Personally, I can't be bothered to do it (since I'm not traveling with kids), but I admire the folks that have the time and energy for that stuff, and I like to see what they come up with. I never saw anything that was in bad taste.
When we were taking our decorations down on the last day (nothing too crazy), a couple down the hall said "Oh no! That was how we knew we were close to our room!" They were very sweet!