EF shows an OTP of 39% with an average delay of 39m. IIRC this is the same metal that eventually serves the YVR-PHX run which has also had issues. But in aggregate I'd be hard pressed to say these flights are any worse than 'normal' mainline.
But be aware that some / most of these OAI flights show as on-time in the various flight trackers even when they are hours behind the published ETAs. Dunno why.