Blizzard has reached an all time low with this "catch up" mechanic. Some people may like the fact that you can get 10-20 "epics" an hour on the timeless isle and gear your alts but really do you feel like you earned anything? Do you have any sense of accomplishment?
The timeless isle feels more like fast food than actual content. Sure it filled that hunger to gear your characters but after you're done the process in as little as an hour or 2 whats next for you? Obviously you're not going to pursue normal modes you missed out on with your alts, no... you need the gear now to get into the next LFR.....
So by all means run around the little island( that looks like it was made in an afternoon at Blizzard HQ with some editor) and get your "epics" that should be coloured grey/green considering they are rediculasly common (dont believe me? check out the price of sha crystals on your server)
anyway the Isle will get boring fast when people realize fast food content isn't good for the game.
Quality over quantity.