As a long term gator user..i never really found them slippery when wet...but there are occasions where i have had slips, but you can probably expain them away..
When new, they're very slippy in the wet. They need some miles to scrub up, then they're fine (maybe a week or so)
I have slid badly on bends....but, who's to say ANY bike with ANY tyre wouldnt have. Bends are classic places for diesel spills...no tyres will cope with that.
All my bikes over 10 years, probably 4 or 5 pairs of Gators, winter commuting the lot...yes, occasionally you'll get punctures, but i havnt had one in about 3 years. Most of it (punctures and grip) is about you and how you ride. Push into corners in the wet...You're going to risk sliding, ride sensibly, they're fine. Punctures..don't ride in the gutter, you probably won't get any.
Its a how long is a piece of string question...everyone has different experiences, but everyone has different road positions, riding style...and luck.