Parker's age is a concern, but quality wise he's IMO much better than turds like Denilson, Diaby and even Song (who's quite a good player but a bit limited)
I don't know why other teams aren't after him, but there's no parallel between his situation and players like Denilson and Bendtner. The latter two have been publically rejected by clubs who have no interest in taking them on, while with Parker, it's probable that teams are after him, given his excellent performances last season, and their interest is probably being kept under wraps to prevent a bidding war.
http://www.footballtransferleague.co...r=Scott+Parker
So much for others not being interested
Didn't west ham reject a £12mill bid for him? Old, Overrated, Overpriced. Would be worth considering if he put in those performances somewhere when he was 25, but for a 30 year old to take up the role of "highly mobile, CDM" is asking for trouble.