We’ve never had a bad view, though we prefer #1) a higher floor and #2) the Epcot side.
We like the higher floors - that way we avoid feeling like zoo animals on display. Some of the ground floor rooms are right on walkways. We don’t want to end up with the curtains closed day and night.
We like the Epcot view from personal preference. Like SG stated, you can see very little of Illuminations, perhaps a few of the higher fireworks. No music, no globe, etc. We do like hearing the fireworks - it will rattle your windows if you are on the 5th floor. :wacko:
The quiet pool view is, well, quiet. Just not our preference.