They haven't really updated the old zones much. Outland and Northrend look pretty much the same as they did when they were current. Cata zones it starts looking better. Pandaria was a really nice looking zone. Draenor was nice too. Broken isles definitely was an improvement. Spell and attack effects were given new animations, for Legion. Blizzard changed strategy, from past releases, and now you can buy WoW, and get all the expansions, excluding the current one. So the base game, you can buy now, and when you hit 100, then you can buy legion, unless you want to play a demon hunter.