imo, 1-50 are some of the best levels of the game FOR ME. others may hate it. i think it's cool that there is an option that people can use if they want, but i do think that it should be limited to 2nd/3rd class/characters. not that people learn how to play their class in levels 1-50, but they learn how to play the game itself. might not be as big of a problem for mmo veterans and such, but for a new player, i would still heavily advise against trying to get powerleveled in any form. however, if they want to just jump to endgame/lvl cap, by all means go. but from experience, i know that some of the midgame CAN BE the most enjoyable.
just my humble opinion. this does not really mean everybody feels this way(heck, i think most people think the opposite), just another way to enjoy the game.
on topic: power up pills/XP orbs in IS really don't impact me in any way. if thats how u want to go fine. i think it's great for alts. i will just keep advising newer players to at least try the lower levels before they decide to rush through the game. if they heed my advise, good for them, and i hope they have fun. if they don't, good for them and i hope they have fun. i couldn't care either way, as long as they are playing the game how they want.
TL;DR: indifferent