Man of Honour
Actually they can be a little better in terms of lateral grip (cornering) as well as reduce chances of aquaplaning, however in terms of braking and general use then no, they're not a sensible to tyre to use. A good quality summer tyre on a rainy day when it is mild will perform very well/better.
However if it's cold, then yes winter tyres perform better if its wet or not.
However if it's cold, then yes winter tyres perform better if its wet or not.