How long is a piece of string - all wine enjoyment is down to individual taste - for me the fuller the red or dryer the white, the better.
With whites I am happy to glug Asda Muscadet at less than £3 a bottle, enjoy many of the Chardonnays at £4 - 5 a bottle, Chablis similar, Macon Village is nice, Pouilly Fume and my personal favourites are Sancerres from probably £8 upwards and Cote de Beaune say £10 - infinity.
Overall I prefer reds starting from M&S French Full Red(which isn't very full) but at £5 a litre is great for glugging as are many of the Ernest & Julio Gallo californian wines, another from M&S Old Vines Grenache Noir and my current favourite is an Asda antipodean called Pencil Pine at around £6.
At the moment I have bottles of Fitou, Medoc, a couple of named Chateau bottles of St.Emilion, a few Neuf du Pape and my absolute favourite which I can only afford about once a year is Gevrey Chambertin (£15-25)although anything from Nuits St George I can force down
and when in Ibiza happy to glug Monistrol white or red and enjoy a nice Rioja like Marques de Risqual or something like that
I do enjoy my wine