When I got into biking many years ago, about age 50, a hardtail MTB was my bike of choice. Slicker tires are a necessity, (Nanoraptors are one compromise), you don't want to be pedalling the big knobbies on the pavement. I did my first century on an MTB, though a little slow. MTBs are great fun in the city, they eat up potholes and ride over problems easily and you sit fairly upright. If I was looking new, I might pick a 29er instead, (a size down), or grab a good used Trek or Specialized 26er off of eBay. I still ride a MTB for commuting, though I'm a road bike guy. My street MTB either has the sus fork locked-out or I've switched to a Nashbar rigid fork.
I'm a road bike guy now, but I have two street ready MTBs in the garage...one for heavy touring, one for commuting, (+ a dedicated dirt MTB). Hybrids? Not interested, they appear too much of a compromise to me.