Dunno about horrible, but they've certainly never really had the smallest bit of interest to me, at the least. Stuff I look at and go, "Why would I play this instead of watching/reading a LP, not have to deal with the fiddly annoying bits, and still get effectively everything of value from the product?"
I've never had much luck getting into a normal-ish adventure game, though. One of those things where I'd rather just read a book or somethin' -- plot gets in the way of the gameplay, gameplay gets in the way of the plot, and generally the mechanics et al involved are either vaguely unpleasant and/or boring or just functionally nonexistent.
Can see why some folks like 'em, but the things by and large seriously aren't for me. Exceptions have mostly been VNs rather than more western styled stuff along those lines, that have a serious gameplay component alongside the plot-y bits. Only rough bit there is a number of the ones with good-ish gameplay are, well... without a better way of putting it, they're also porn. Which obvs doesn't bother me (save that it tends to detract from the plot and such to some degree), but there's other components involved, heh.