Sometimes I watch vanilla/bc pvp videos for fun and Ive noticed that there were a lot less buffs/debuffs/abilities back then. When a rogue opened on someone, the only debuff would be cheapshot and maybe one more. But now when I open on someone (as a rogue) there are instantly like 7 debuffs. This cant be fun for a new player and its not all that fun even for me. It isnt any fun glancing at all of the debuffs and figuring them all out. This could be very overwhelming for a new player and cause them a great deal of confusion. Personally I just think Vanilla/Bc pvp looks a lot more fun.
Many of the old raids had very simple mechanics (it appears) that one could probably understand relatively quickly. But now I feel like every boss is very complex and requires a lot of knowledge before-hand. Ultimately making pugging harder>casuals hitting a brickwall that requires a lot of effort (effort they dont want to put in due to the time/reward ratio)> and ultimately making them quit. Im more motivated when I feel like after I get "geared" that I will have a good shot to keep gearing than if I know as soon as I get "LFR geared", Im going to have difficulty continuing. If people feel like they have a real shot to get into pug raids, then I think they would play a lot more. I know I would.
On a side noted: What made blizzard think people wanted Scenarios instead of heriocs? I have never once seen someone ask for scenarios..