town hall 7 is good at taking out other town hall 7 and below, as it should be, but no maxed town hall 8 should be letting dragons get more than 1 star on them.
Mass dragon attacks are pretty lame. Sprinkle in some other units for excitement!
No well laid out max th8 can be 3 starred by 10 lvl2 dragons. Lvl2 dragons sputter out around 3 lvl5 AD and lvl8-9 AT's, tops. Once upon a time a guy with almost 500 war stars (when only 2 players in our clan had that many), arrived at our clan and hung out for awhile, claimed he'd (he was a tH7) 3'd a full max th8 base in the past. He attacked only extremely easy bases with lightning and a couple hogs...
If its ever happened its against an awful layout.