People have a lot of incorrect assumptions about tires. Slick tires are actually the grippiest tire for smooth, wet surfaces. The tire conforms and fills in micro-cracks and little gaps in paving, and that's what gives you grip. So, theoretically, the only time knobs are better than slick tires is when your surface can be bitten into, like dirt or gravel. On pavement, tread just means less contact area, which means less grip.
MTB tires are also often wide, which is a big reason for the association with traction. Mount up 2-inch wide slicks and your grip will be just as good as a knobby, or better, on pavement.
Slick tires in rain are perfectly fine, and slick tires aren't any more or less likely to get flats, that's about the casing. I would say these tires will be fine for almost everything you can throw at them; the only time you might want tread is if you're trying to climb off-road and can't get a grip on wet leaves, dirt, or sand.