Regardless, the small crossover SUV was derided and as the Wikipedia link above states, sales never came close to expectations, so both critics and the car-buying public seem to have been in agreement.
What isn't generally realized is that the Aztec shared its platform with another compact crossover that had more conventional looks and sold a lot better. That car was the 2002-07 Buick Rendezvous. Let's compare them.
Following a period in the 1980s when certain Pontiac, Oldsmobile and Buick models were badge-engineered to the point that their similarity became an embarrassment to General Motors, the corporation worked much harder to make sure that models shared by different brands were visually distinct. That is the case with the Aztek and Rendezvous. If you compare the windshield shapes, wheel housing positions and door cut-lines, you can see that the underlying structure is the same. But all the exterior sheet metal is different, and the cars even have differing rooflines abaft of the rear side doors.
In terms of general appearance, the Aztek has a flatter look whereas the Rendezvous is more rounded. These differences are physically slight, yet sufficient to affect the way highlights play on the surfaces. The Aztek has an odd, double-deck version of the (since 1959) Pontiac split-grille. The Rendezvous' grille is also a bit "off" in that the ensemble features an oval shape sliced horizontally near the top edge by the hood cut line. Above the cut is a chrome panel with word "Buick" on it. This geometric composition is at odds with more flowing lines of the rest of the car.