Taking a quick snapshot is limited by
- Time to turn camera on and be ready to take a photo
- Ability to frame the subject
- How quickly the camera can auto-focus
- What is the combination shutter speed, aperture, and ISO speed
- If flash is being used, how quickly it can recycle
DSLR's are excellent for #3 & #5. #1 is generally slow, and #2 can be limited by the ability of the photographer to use the viewfinder (lack of experience, difficult angles, etc.). #4 is completely dependent on the capabilities of the system and which settings are selected.
IMO, most people don't have their camera in the correct setting over half the time.
In auto mode, most quality point and shoot cameras will be on par with a DSLR in great lighting, and beat a DSLR in poor lighting situations. This is based on my own personal experience learning to use a DSLR, as well as observing friends and family who think a big DSLR will automatically give them great pictures.
The reason is because it takes sophisticated algorithms to determine which settings (shutter, aperture, ISO) are optimal in different situations. Entry level DSLR's don't have the same level of sophistication as a
quality a point and shoot for same price, because there's other components (lens, mirror, viewfinder) that eat into the profit margins.
For years, DSLR's (and film SLR's) have had a huge advantage in auto-focus speed. This is because of two things
- Auto-focus motor in the lens. Some DSLR lenses are focus super fast, others not so much. Same with point and shoots; it all depends, and generally more $$ = faster focus.
- DSLRs use a AF method called phase detection (light is split to a different sensor that determines the focus distance). They can do this because there is a prism or mirror inside the body of the camera.
Contrast detection AF is almost always slower, and this is what has been used in every point and shoot up until some recent innovations by Fuji and Sony. Also "fast' and "slow" are very relative and subjective to each person's expectations and needs.
Personally, if I was in the market for a new point and shoot today, I would
look at this one first.