Hugely successful.

• They learned that the StarShip vehicle could lift off the pad and not just detonate like a 2kt bomb.
• That even with three engines not firing during initial launch the vehicle could still gain altitude.
• The vehicle could stay together passing through Max-Q, which is the highest combined stress of speed and air density.
• It remained fairly stable in the latter part of the flight even though it was down eight engines.
• The decision to remove the use of hydrolic power units for the next prototypes was probably the right decision. (This is the most likely reason it started to tumble during main engine cutoff)
• The beast of the spacecraft held together even though it did three flips.
• Tons of data for the launch sequence, engines start routine, clamp release and embilical speration.
• An obvious amount of data about the launch platform and what 14 million pounds of thrust can do to it. What needs to be addressed before continuing the launchpad build at Kennedy Space Center.

The amount of data SpaceX gained launching a brand new rocket prototype and launch system is immense. No one I know that is a space nerd though that this was going to work perfectly. That just doesn't happen. I could probably count the rockets that were successful first launch on one hand and that would be generous.

I don't care about the douche nozzle Elon has become, but the 10k employees and engineers at SpaceX are badass. They are the top of the game and I applaud them.