Mate i am very anti Etec but as i said from experience, personal experience, however, as you have stated, they are some very happy etecs owners too like Ross, i have notice the happy owners all have under 115 hp...How big is yours??
Mate the main issues has been the motors not being good with the fuel, 6 of them are wasting heaps of fuel, even after quite a few prop changes, My mates boat which has been discussed to death was a bad case.
Also BAd service from BRP themselves, probably some bad dealers too, One etec was blowing so much smoke the driver could barely breath, As recent as last week a member here which i was chatting to on the phone said he regreted buying his as after a few outings the engine has lost heaps of power compared to when it was first put on.
A couple of them have also had power head issues,....
There is no right or wrong when it comes to 4 Stroke or Etec, All we can do is judge from our own experiences and im just stating mine...