Well, I think the fact that Zap, the company that started importing these things last year, has had to make significant modifications to meet (minimum?) crash safety standards is a pretty good indication of how weak they are. However, we will see some redesigned version here in the US that's cheaper to make.
Personally, when 1,500lbs vs. 6,400lbs occurs, the Smart isn't going to seem so smart afterall. And the S-Class is designed to meet bumpers with other cars. The H2 will come in at a much different place on the frame. The S-Class also weighs less than an H3. And finally, we don't know at what speed this occured.
Here's the NCAP ratings:
Frontal Impact:
http://www.euroncap.com/content/safe...p?id1=1&id2=29
Side Impact:
http://www.euroncap.com/content/safe...p?id1=1&id2=69
And that is for a SMART Vs. SMART, kind of like SPY Vs. SPY.
From EuroNCAP:
Can results be compared between different categories of cars? No. Results should only be compared within the same group. The frontal testing method mirrors a crash between two similar sized cars. The Euro NCAP tests cannot be used to predict the outcome of such crashes between cars of different heights and masses.