The adapter getting hot or the unit getting warm to touch is normal.
3hrs from 10 to 100% also sounds par for a 5W adapter.

I really hate the adapter as there is no grip at all to unplug it and somehow is too big to fully go into the port. Damn sounds like I am describing pr0n.

from the above 2 cases, Belk and Rock, what happens when the front cover is opened? Does it fold back flat or is there some crease / bulge on the hinge?

As you may know the original design smart cover can open 180degrees and fold back flat...

I'm sure there are those of you having the unit not being able to charge to 100% due to the charger problem...is it true that if you send it in for warranty claim, they will do nothing and just return it to you? This is what happen to my colleague, I was there with her the whole time.

I thought they will replace the charger?