Frankly, my initial reaction to any sort of flagging was negative. I started in EverQuest and its Planes of Power expansion each tier required its own flag. Once guilds got far enough along, latecomers like myself were well and truly screwed as most guilds weren't inclined to go do any back-flagging. They'd usually mumble something along the lines of "how the hell are we going to progress if we're holding newbies hands through the same zones, day after day." Thankfully, pictures of the guild leader and a goat came in handy.
Thankfully, WoW has few attunement needs--Kara being the most common. Even almost a year later my guild is more than willing to help me through the process--it seems everyone has two or three alts needing this, so groups have been easy to come by.