So many negative replies here. I won't add to that.
I LOVE the mustang. I have had 3 so far, a 68 Fastback GT, a 75 Mach 1, and an 89GT. Reliability was only a problem with the 68 wet weather and points just didn't always get along. You didn't mention where you live...I'm in New England, and I've driven all these cars in the snow. Are they a handful...yes. They all would have benefited from snow tires. But as long as I wasn't driving in snow over 4" deep, and I was careful, I managed to get where I needed to. Rear wheel drive wasn't an issue, in fact I enjoy it! All 3 Mustangs had 302 V-8's. Mileage varied, but usually in the 15-18mpg range. I have since restored my 89GT and use it only in fair weather, about 8 months a year. My 89 hasn't seen the mechanic in almost 5 years! I've put on subframe connectors, a Cobra bumper, a Cervini nose, lowered springs and suspension, larger rims & tires and a fresh paint job. She still turns heads daily. Learn to drive a standard, you'll never look back! Above all, the Mustang is FUN! Far too often, people get disconnected with driving. The car is often seen as a way to get from point A to point B. The Mustang makes the trip a pleasure, something to enjoy. The only weak spot I've had with all these cars has been the heater core.
Ford has improved the quality of their manufacturing in the past few years. The Mustang is their flagship vehicle, just check out all the variations and independent builders: Shelby, Saleen, Rousch, McLaren. The stats on these cars are amazing, however the price also reflects that. The Mustang is a great base car to modify and personalize. The aftermarket is a tremendous resource, whether you want engine modifications, body packages, or suspension alterations. The online community is also second to none, I have found so many knowledgeable people to provide advice and suggestions.
There's so much to like with the new Mustangs. They have an aggressive appearance that is very striking. I partially agree with MacDrive regarding the tail end of the new 'stang, but I take issue with the puffy diaper comment. The rear is actually very similar to the 1970 Mustang. I would have preferred something reminiscent to the 68 but you can't have everything! My dream is to get the Shelby GT500.