You can only intimate your feeling covertly but telling her straight out will not be believed and most likely highly resented. You must simply remain strong for her when the time arrives, if she is smart, to discover his deficiencies on her own.<br />
Do remember after she arrives at this point it is prudent not say I told you so, even if you are inclined to do so.
view your opinion simply , don't go into it deeply, then back off. It's her relationship.
You just tell her and if it hurts your relationship then she is a ****** friend anyways and who needs her!!!
Chicks before d*cks!