Sweetness scale

[Dapapa55]

Just curosity. You go into a store and they have hundreds and hundreds of wines. Clear to very dark. Costs are from Two buck Chuck to $100.00 If one wants a sweeter wine or a dryer there is no way to tell. Boones Farm is all sweet. Mogan David is on the sweet side. Rhine seems much less sweet. Sangria is sweeter. Odd that peppers have a hotness scale but wine has a try it and throw the bottle out if you don't like it approach. I really thought that wine producers would have something except for their tasting room. I would really like to try some wines but without any clue as to what I am purchasing I'll just stick with the same old. Thanks for your help.