Isnt the Raven sorta a Runabout meets the family camper/rv style of ship anyways?
Actually it's much larger. A runabout is about 23m in length, the Raven is 90m and it has a shuttle bay. I would like to see it as a starter ship it would be a nice alternative to the tired Miranda/Centaur.
The Raven was a civilian survey ship. At least the Hansen's weren't members of Starfleet, anyway. If I recall correctly, Starfleet in fact knew what they were looking for and didn't approve. You'd think, if it were a Starfleet ship, they'd have denied them use of it at that point.
It'd be good for a larf as an NPC ship you need to rescue, a background NPC vessel for social systems and Sol, or a token player ship like the runabout. It seems like an easy enough design to reproduce. But for Starfleet to use it in a fight? Canon can't even confirm it had as much as a single phaser on it. I'm inclined to be on the side that says that's because it probably didn't.
We have seen the Oberth in both civilian (SS) and Fed (USS) hands. I can imagine the Raven doing the same. Either as a low-tier Science ship or a low-tier escort. Given that the Raven shadowed the Borg for some time and remained undetected while they conducted observations, it seems sciency to me. It could be a science ship alternative to the Miranda beginner ship for the Feds.