Those can be great or terrible. For Sainsbury's their own food is worth a look, but the drink worth avoiding, at least in recent times. I think their wine buyers in particular should be fired. Once well respected in the industry, the current crop I imagine hanging around in a pub hissing, 'Mate! Mate! You wanna buy some wine? Really good! Proper stuff from foreign places, not made by me mate Gavin in his shed at all! Only £9.50 a bottle! Meet me in the car park in twenty minutes.'
(I'll look at some online reviews to figure out which one your whiskey was first, but I'll try it! Thanks.)