The Droid Charge is a low to mid level phone (more on the low end considering the specs are pretty much 1 yr old tech). It's an entry level phone. I think if you want to look at how well android can run, a better representative would be the Nexus S, G2X, Sensation, or Galaxy S2. Looking at a phone with old specs is like me saying that IOS on the Iphone 3g is slow (not exactly a good litmus test for an entire OS). I'm all for making both sides of an argument but let's at least be objective.
The Charge and Thunderbolt are the flagship LTE phones for Verizon. If the Charge is one year old tech, then Samsung is putting out garbage if 1 year old tech is that bad. The iphone 4 tech is 1+ year old, and if it can perform so much better than Samsung 1 year old tech, then I have low regards for their newer models. When the iPhone 5 comes out, a year later, Samsung newer tech will still be worse.