Not really. Also, any bike that can be endoed can be stopped amazingly fast if you shift you weight. If you can't endo your bike, the brakes aren't tuned optimally. I can do a stoppie on my road bike, but it took a lot of tweaking with the brake system to get it to that point. Now, to stop as fast as possible, I dart up, get my weight back as far as I can, apply front brake almost to the point that the rear wheel wants to rise, then apply enough rear brake to almost lock it up. You'd be surprised how fast I can stop. On the road, I can stop faster on my road bike or hybrid than I can on my MTB. First off, my MTB's knobbies have less contact with the asphalt and the tread blocks distort. It's easier to lock up my MTB tires than it is to lock up any other bike I have. Therefore, I can't brake as effectively. Also, the front suspension loads on my MTB during heavy braking, making it a little more difficult to shift my weight back to bias the brakes.

The road bike and hybrid on slick tires can turn much, much harder at a higher speed. The mountain bike's knobbies are a compromise on the road yet again, as the tread blocks produce uneven traction during hard cornering. At a very, very low speed on the road, all of my bikes have about the same turning radius. On pavement, the mountain bike offers no advantage over any of my other bikes.

The hybrid, however, is great. It has slicks on it that are 1.25" wide. I can drop it off of curbs, hop curbs, or accidentally bounce in and out of a pothole without getting a pinch flat. The tires are wide enough to avoid getting lodged in most of KC's storm drains that would swallow my 25mm road tires whole. The slick tires run efficiently at 80-85 PSI. They're soft and comfortable, but don't have energy-sapping knobby treads to increase my rolling resistance or to get in the way of hard cornering and braking. If it was geared better and had the drop bars I like, it would basically be a heavy 26" wheeled cyclocross bike with absurdly wide tires.

It has the comfort advantage of my MTB, but the handling characteristics of my road bike. It's just a bit on the heavy side, and as it sits, my road bike is a more stable and efficient machine.

On mud, sand, water, dirst, snow, or unstable surfaces, the MTB will arm you with purpose-built characteristics that do indeed lend themselves to better handling. If you're commuting through corn fields, on gravel roads, and in snow, the mountain bike will have obvious advantages.

Really, though, handling is one minor trait in a sea of variables that go into one's ideal commuter bicycle. I see plenty of mountain bikes on the blighted, pot-holed streets of downtown KC. If I were to stop and ask people why they're riding a mountain bike as opposed to some other kind of bike, the answers would vary from "it's got a softer ride feel" to "it's all I've got, and I can't afford a different one".

The only person who can tell you what's right for you is you. The only way you'll ever know what works best for you is to experiment.

Do I regret owning 3 bikes? No way. They all have their strengths and each of them occasionally becomes the best bike for the job. For my 28 mile RT commute, my road bike is a trade off of comfort and durability for speed and efficiency. The hybrid would be more comfortable over long distances, far less prone to flat tires, and much more resistant to abuse than my road bike, but it would be sluggish, and I would find myself running out of gear on the downhills and long, flat stretches of road that I encounter every day.