No, to be fair it's not- but it's something that can be quite noticeable with the xps notebooks.
There's a whole list of things to watch out for:
Wonky keyboard due to misplaced wires underneath (Can be easily corrected if you don't mind taking it apart- but it is only very slight anyway)
Large gaps at hinges of screen (Only had this on 1 of them)
Static noise through headphone sockets (This is one thing all of mine have suffered from- quite bad static, apparently because the wires are not shielded sufficiently- I have seen some fixes floating about but never tried them)
Gaps around LCD bezel
Uneven base causing it to wobble on a flat surface (You can fix this yourself though with a bit of a twist)
Keyboard can occasionally miss strokes (very strange as never sure whether it's a placebo effect or not)
Wireless dropping out (Believe this is more to do with compatibility with various routers rather than an actual fault as such)
Top of bezel rubs against touchpad when closed (I did experience this and have had to use a crumpler slip to prevent it happening anymore)
I wouldn't worry too much- Dell's build quality has seemed to improve as the m1330 design has been around for a while now. Besides if you do see any of these issues (and they do bother you), Dell will happily send you a new one!