So I've only had pop tarts a couple of times, because my brother picked them up from this sweet shop in town that imports American sweets/foods, but puts a ridiculous price-up on everything (like well beyond import-tax/VAT).
I can't really tell if they were nice or not.
I think I could eat them quite a bit, but I'm not sure that I could actually say that I like them. They're kind of something of nothing.
I think you can get them for a more decent price though at the supermarket now though. Tesco at least seem to have started to import more American products at a fairer price.