-The dialog is now summarized response text instead of the entire response. So what? That's a matter of presentation, not of "dumbing down". They could have written the all the responses out and you'd get the same thing. This is nitpicking, at best.
-There are less ways to equip your character. Restrictions on non PC equipment This is the one thing that did get simplified, but not as drastically as you make it out. You have a few less slots for your companions, but at least they don't have to wear clown suits anymore. And you are still free to dress yourself in any horrid thing you might pick up. I'd say the change is sideways, with the good canceling out the bad.
-Gift Giving isn't as open anymore.They removed the rep grind. How's that bad? The old gift system was broken. You could almost max out rep with Morrigan before leaving Lothering. Gifts in DA:O removed any impact the whole companion reputation system might have on the game. Gifts actually mean something now.
-Fewer tactic slots While I admit I haven't went and counted, I'm calling bullshit on this one. There are more tactic slots than I can make use of (you get more as you level up) and there are more conditions/effects than in DA:O. So it's the opposite of "dumbed down".
-Game takes place in basically one area Dragon Age:Origins basically takes place in one area, Ferelden. Yeah, your point is about as valid as mine.
-Fewer skills. Herbalism, Poison making, trap making, etc. have either been removed or combined. The skills were removed because they were a poor mechanic. Survival was useless, Crafting was tedious and everyone maxed Coercion anyway. Skills had close to no impact on how the game played out (except Coercion, which as I mentioned everyone maxed anyway) and I honestly can't say I noticed they were gone. The new crafting system is vastly superior.
That's all off the top of my head......