Harrington was not a bad choice, He has just been on crappy teams. Add to the fact he was rushed into playing in the NFl as a starter because Detroit's QB was Charlie Batch.
You drank a lot of the Millen Kool-Aid, didn't you?
Millen was an issue. No QB has stood a chance in that system for years. Even before Millen. Problem is everyone thinks the QB is what makes a team. It takes a TEAM. You need blocking, You need Defense and you need a balanced offense. Detroit has never had it all at the same time. Back in the Sims/Sanders days all the pressure was on the RB's, 4 runs and then a pass. Poor coaching.
The Lions have been through a a lot of QBs that should have been something but they never shined. Harrington was the best of all of them in the last 20 years.