I used to like Salt House too, but I can't say I've missed it that much as I think there is a wide choice of great restaurants that range from the more traditional meat/fresh fish to a varied menu in the like if Blue Note and El Mirador in the marina.
I think this post was a great question, and other that what's been mentioned of a Lidl, I'm not sure I can really think what it's lacking! Which is a good thing I guess!
I agree that it's not the sort of place to be putting up night clubs, and that there are plenty of restaurant & bar choices too - I think you're right about the supermarket ideaDoes anyone wish they could buy any brands that they are used to in the UK in a supermarket/shop in Lanzarote??