Yeah, they are really bad. There is absolutely no reason to get them aside from getting them for Book of Dragons.
The 5* is especially bad. Increased attack is something that many dragons give (and all of them do it better than this one). And the other 2 parts to its ability are both things that allow your dragons to dodge basic attacks/tiles. Worse of all is that these interfere with each other (AKA total dodge isn’t the same as % accurcay down + % invisibility). And cuz of that the invisibility part of the ability is completely wasted (normally it gives a 30% chance to dodge, but cuz of accuracy down it’ll only boost the dodge % by 14%). Having anything else in place of it would be way better.