Manuals are best for performance vehicles. I dont care how you build your automatic ******, there's no substitute for manual control of your RPM's and clutch management. With an auto, if you install a serious stall converter to hook hard off the line, its gonna suck to drive in traffic. If you use a standard torque converter, you lose a lot of power off the line. With a manual ******, you can control the car to handle any of those situations. For example, in my chevelle (strong big block) I can get nice smooth acceleration from a stop light in traffic. But if someone wants to race, drop her in second and dump the clutch at 3-4k and watch the front end come off the ground. Then power shift (no clutch) through the rest of the gears.
If someone thinks an auto is 'faster' than a manual (all other factors being equal), you just aren't very good with manual transmissions.