[SalesForce] Get all List values from a map

This controller:

public class MyController {
    public Map<String, List<String>> myMap {
        get {
            return new Map<String, List<String>>{
                    'abc' => new List<String>{'123', '456'},
                    'def' => new List<String>{'654', '321'}
                    };
        }
    }
}

and page:

<apex:page controller="MyController">
    <apex:repeat value="{!myMap}" var="key">
        <apex:pageBlock >
            <apex:pageBlockTable value="{!myMap[key]}" var="listItem">
                <apex:column value="{!listItem}"/>
            </apex:pageBlockTable>
        </apex:pageBlock>
    </apex:repeat>
</apex:page>

produces the expected repeated page block tables (as the apex:repeat automatically iterates over the map keys).

So I think your problem lies in the code that builds myMap or in the code that exposes it from your controller and you have not posted that code.

The map's value (ProductWrapper) is incompatible with the list's value (Product2). You'd have to extract the values manually:

for(ProductWrapper wrapper: mapProducts.values()) {
    productList.add(wrapper.product);
}