Although a focus on variant covers and event buzzwords would seemingly imply that Legacy heralds the decline of Marvel as a publisher of comics, the actual content being promised sounds, well, promising.
The upcoming one-shot, written by Jason Aaron and drawn by Esad Ribic, is too zany not to love. Just look at Ghost Rider here - he's on a mammoth! That's awesome!
There's also the matter of the solicitations announced thus far, which, while undoubtedly typical of any ordinary Marvel year, contain some truly inventive books with some really unexpected creative teams. There's a clear commitment here to divest from tropes gone by.
While 1,000,000 BC Avengers probably won't appeal to everyone, it's the sort of zany, fun story that Marvel has sorely lacked in recent years.