Trent Dilfer. Mark Rypien.
Not Dan Marino, Jim Kelley, Warren Moon, Fran Tarkenton, Dan Fouts ...
Seems to me a true no-doubt first-ballot HOF-quality QB can lift an otherwise above-average team to greatness, but they are indeed unicorns. You can't plan for one, they just happen. If you're lucky enough to get one, then it's up to the organization to give him enough support to put it over the top.
Haskins doesn't look to me like a unicorn at this point, but then again neither did Brady or Rodgers to me after one year. Haskins could surprise me and become The Next, but until I see that, based on the progression so far, I've got him as a guy who has a decent chance to be good enough for long enough that Rivera and the organization can build enough around him to get us into legit contention.
Which is all I've ever asked of a team I support.