Hmmm two, if not three topics running in tandem here and too intertwined to split one topic off from the other.
Eyeopener - Hungry Eyes: I got 2 or 3 requests for this over the last month - so it was still hopelessly outnumbered by the requests for more (dare I say it) "traditional" party favourites, such as Kylie: Outta my head, and even Robbie: Rock DJ etc. However, on the few occasions that Hungry Eyes did get played, in amongst things like "DJ Sammy: Heaven" and other up-tempo dance favourites, it held its own in the middle of a couple of better known tracks. Probably wouldnt have led/started a dance set so well though - not in terms of pulling an audience onto the dancefloor.
Cover versions in general. Yes, there do seem to be a good few cover versions of well-loved classics from the 70's and 80's. You almost get the feeling that a load of 20 year copyrights must have run out every so often and not been re-newed by the original artists and so rights to the song have been snapped up for less than the cost of paying a writer for a new song. However, a lot of 70's songs seem to go through a "remix of the original artist" stage, before they get to the "covered by a totally different artist" stage.
Sometimes the remix of the original can be a good thing, so long as its differences are subtle and none of the original essence is lost. For example: I've got a very subtle DMC remix of Sister Sledge: We are Family, which I'll play whenever I, or the audience think that "we are family" should be played. Its seems to high-light the originals good bits, without adding new drums, new st st st stuttered lyrics or overly long instrumental breakdowns etc all over it, like the 1984(?) re-released mix of it did...
One good thing with bad covers or bad remixes, is that they give the perfect opportunity for the original version (or in your opinion the "Best" version for "that" particular crowd) to be played. One example here is "Car Wash". Christina and that angry noisy lady(

) released their cover of it, complete with lots of chatter about fishy sharks tales all over the beginning, and a rough rap breakdown in the middle, and I didn't even bother buying it. Just played the original with the pitch nudged up 2% - went down really well everytime.
As for how much lighting should be piled into a venue...we've got several threads providing most "illuminating" insights into that, and whilst I'd agree that turning up with three identical lights and just leaving them running all night would be terrible and might get some negative feedback, I've found that once you've got enough lighting, and the right sort of lighting to provide a non-white atmosphere in a venue then theres no benefit, to the public, in buying, transporting, PAT testing, hanging, and servicing anything more.
I paid the price (literally) early on in my days, of spending upwards of £800 on a single lighting effect, which totally relied on smoke and a good vantage point to be effective. I ended up swapping it 2 years down the line for a top of the range radio mic system, which gave more benefits. It's not wrong (or right) to have more lighting than the guy, or pub down the road, but switching on light no.6 rarely does anything to the atmosphere that lights no. 3,4, & 5 didn't do already - unless theres another DJ (or landlord) watching.