I walk up to a same level regular mob, hit shadow burn twice and that kills it. It takes no mana, it gives me back the soul shards right away that it costs to cast - I could kill INFINITE mobs like this with no downtime and no damage taken at all. I don't even have that heirloom gear that I see so much talk about, I'm starting on a blank account here and all I want to know is how much longer do I have to watch two TV shows while playing to remain entertained =P
The quests were not complex, but 3-4 mobs could easily kill you if you carelessly walked into a mob camp. Now everything dies in 1-2 hits. Bosses in dungeons die in 20 seconds while posing no threat at all. I remember parties wiping in Hellfire citadel, instead we just walked over all three bosses in very short time last night with a group that didn't even talk.
If you think that's "basically the same" as in 2005 / 2006 I guess there's just no argument here.