The dumbing down of 4.0 is a travesty. The entire concept of trying to make a pen and paper game geared towards the masses is laughable. Somewhere, some higher up thought that they could appeal to the common man and sell more copies. What they did not realize is that the common man is never going to buy a pen and paper game anymore. They will play their consoles or flash games or whatever and continue to look down on those who play board and role playing games.
OP, whatever you do, as GM you get to figure out how in depth the rules have to go. Do the players NEED to roll an encounter per the rules or can you just have 1 encounter and move on with the plot? Do the players need to specify their load-outs or can you assume some things?
The last time I was GM, I ended up having players roll a bank of D20's that I put in a number list along with their current saving throws so I did not have to clue in players about possible things around them. I would just consult the chart every once in a while, players had no idea if it was a ruse or not, if I was doing a spot check, or a listen check, or a saving throw or whatever.
Make the game your own, find out from the players how in depth they want, if they want a scenario or dungeon crawl or an entire campaign with a world or what.