@Silverhairedcat
YANBU. Thornton choc used to be scrummy but now it's bleh! Same with most of cadburys.
Also, I had a munchies egg (yesterday,) and the chocolate was bleurgh! And the munchies were average too. Kinda stale tasting. I threw 2/3 of it away!
Also, double deckers and rolos and topics and kitkats are rank now too. And DH brought me 10 ROSES choccies that he nicked out of the tin at his works. I tried 3 or 4 of them, and they were so putrid that I spat them out, and binned the other half a dozen. They tasted like lard. Also, they all tasted the same, despite (supposedly) having different flavours.
Not a fan of hotel chocolat either. Overrated and expensive IMO.
WTF has happened to our chocolate? 
Only Cadburys DAIRY MILK, is ok now (IMO.) And the creme eggs are still OK but not the same as they used to be.
As has been said, it's seems it's down to them using palm oil. It makes it cheaper to produce, but it makes the chocolate quite yuk! 
Dark choc is not an option, as I don't like it. It tastes bitter, and it not enjoyable at all.