well frankly all the naxx 10 man and naxx 25 man are very similar in stats with the 25 man loot of course coming out above. I think Blizzard just made this an opening raid and they wanted people to feel very comfortable with it. I think that soon people wont even be able to do the 10 mans later on only the largest and best guilds on each server like it is now. I just think they made this stuff much more accessible to people so that casuals could get gear more easily. I mean most people waited to get kara gear until their guild had a core amount of people that cleared it and then they just started gearing others. I think that Naxx is just blizzard's attempt to please and smoothly adjust people int wotlk and not feel left out. Or feel that they have to turn to PvP to get gear. I find the heroic gear is going to be good also and it wont be jarring for people if they get a few heroics under their belt.