IMHO, the Modus is suffering from the same problem as discussed with the Golf+ in previous posts. I can't deny that it's interesting, but in the transition from edgy concept to production car, it underwent some Echo-ification that ruined it.
If you've seen the Echo Hatchback (not sold in the USA, but it's available here in Canada and I'm not sure where else), you'll know what I mean. It's just the latest iteration of the small bubble-cars, but attempting to grow some edges like the more recent designs.
It is a neat little car, but I don't think I'd drive one.
As to their other cars...I like the Clio and Mégane Hatch, although the latter is still suffering from a low beltline. If they'd made the windows a little shorter (height-wise), it would be great. I do like the cut-off kamm back thing, though: take a look at the Carrera GT for the ultimate expression of that, at least in terms of the cabin...
Alternately, they could do what every car manufacturer needs to do: follow the Porsche 911 Targa and Boxster coupé, or the Honda Insight, and give the car a nice gently sloped glass hatch.