As is often the case with Mopar, the Dart looks fabulous but is still a Dodge. As many have mentioned, that probably means problems throughout the whole drivetrain. I want to think that all car companies make decently reliable vehicles now, but I've heard too many recent stories from people who bought new Dodges and had major problems with them. While Ford and Chevy (as well as a host of smaller Asian makes) were fixing their design and reliability issues around the turn of the century, Chrysler was still busy making poorly-designed engines and mating them to transmissions that aren't made for them, as well as some poorly-designed and poorly-built transmissions of their own.
I didn't even consider Dodge because they don't make a hatchback short of a Jeep or Journey, and the most efficient Jeep is capable of 30 MPG highway on the rare occasion that it makes it that far from the shop. I need efficiency, and I sometimes carry big things (hence the name). I would have been willing to give them a fair shot if they made a small, efficient hatchback (not a PT Cruiser though - those things are awful), but I seriously doubt they would have even made it to the test drive. Every Dodge I've ever sat in, everything just feels slightly wrong.
The one exception in my mind to the 'Dodges are garbage' rule is the Viper, and possibly all Dodge muscle cars. They use the same nearly-bulletproof Tremec transmissions as the Mustang and Camaro (manual, anyway), and as far as I can tell the engines aren't terribly unreliable either. It remains to be seen whether V8 and V10 Dodges have the same problem I've seen with other Dodges, where something will go wrong and they'll throw a wrong and unrelated code instead of the correct one.