Would you, if asked, personally consider Bitcoin anonymous enough for your needs? Does it lack privacy features? Would you consider Bitcoin anonymous, semi-anonymous or transparent?
Do you want an anonymous crypto currency?
Provided that the user isn't stupid enough to let everyone know they own that address that was used to buy meth, it's pretty anonymous.
The only thing that breaks a bitcoin address' anonymity is its association with someone/something. If no one knew who owns that address, no one will know unless the user goes ahead and tells people he/she owns that address.