See, to me, Samsung does have an issue here, but it's not about the "rounded rectangle" shape or the "reasonably thick black bezel": it's the fact they have both of those, like the iPad, but then also surround them with a marginal silver border. I own both the Galaxy Tab 10.1" and an iPad 2, and I actually do get confused between the two all the time, when looking at them from above. They're about the same thickness…
http://www.google.com.au/search?q=samsung+laptop&tbm=isc...
Notice the color, shape and style of the laptops you see, especially their displays. They nearly all have black bezel, are rectangular with rounded corners. It basically has all the features you mention.
Samsung's Galaxy Tab looks as much like they ripped a display off one of their laptops as it does like an iPad. It is essentially their brand, the style of design they have applied for years across much of their range. That's one reason they happen to look more like the iPad than some of the other tablet makers.