The concept of "bad" vs a national best bid or a national best ask can only come via order delay. Better execution via order delay as seen by a customer is always a lie as none of retail brokerages look at the order, look at the 100@101 x [email protected] market and say "ok, i'm buying 380K @ 101.09 from you" followed by posting the trade followed by trying to unwind position. Oh no, they simply present your order by adding it to the book.