I'm playing with another experienced player on this. We have lost only a handful of times in the previous sets. Party is Harsk, Balazar, the inquisitor, and the arcanist. We've only gotten through the 5 basic adventures & the first adventure of the 1 path and we've lost at least 6 times (3 times on the 4th Basic adventure).
We actually switched to the inquisitor from the cavalier because we simply did not have enough magic attack otherwise to realistically get through the 4th adventure. My sense is that any similarly cleric-light party is going to have a very bad time of things overall. The basic adventures are definitely not introductory-level.