On this note, I see a lot of posts where people debate the online sites, Majestic, Naked, TWS etc and compare them to supermarkets (ASDA, Waitrose, Co-Op). I admit most of my wines outside of a restaurant in the past will have come from the Co-Op - although that's mainly because I work in their Southern head office and therefore enjoy raiding their shelves on PayDay weekend when we get 20% off on top of the 15% off for 4 bottles deal! Just grabbed a few today actually!
Now they have their own brands and plenty which say "selected by the Co-Op", but they taste fine to me so far. But I haven't the taste buds yet to register all these differences you refer to in tasting notes - tannins and the like. You can write a whole essay about a glass of wine, I know if it tastes nice in my mouth and doesn't leave a bad aftertaste. If I see a brand that I don't recognise, chances are I assume it's not your everyday cheap-o nasty wine.
Now for the online sites, Naked have the Angels thing and I hear a lot on forums about how that's not as good value as it seems. I look on TWS, the wines sound nice, and it's all brands I've never heard of, but then that's the same on any wine website or hell, in half of a supermarket shelf. Value seems fine across every website with £80-£115 being your typical price for a case, but whether it's Everyday or Premium means nowt to me at this stage - it's no guarantee I'll like the wine.
Bit of a minefield really!