According to Men's Health Magazine they are certainly not Ironman races.
Recently the men's health and lifestyle magazine ranked what they consider the best triathlon races in the U.S.
What are the Top 20 races?
They include several triathlon in California and Florida like the long standing Escape from Alcatraz and Wildflower races.
They also include the Boulder Peak Triathlon which is an Ironman event. Ironically the only IM race that they put into the top 20 is Ironman St. George...which no longer exists.
You can see the entire top 20 race HERE.