I've been able to put together a great team over time. I think if you want to jump into this game and be relevant right from the get-go, then yeah... it's not great. But if you are looking to enjoy the game and be patient, I think he has a solid start.
As I said before, the situation changed get. He won't be getting the past event gears we got (Chiri, and tons of MAG gear).
And the future content will hardly be soloable, even with an overpowered friend. So he must have a decent team to at least support the friend unit to clear future events.
Good units he should aim for in case he pulls on the next banner:
Chizuru/Mercedes (either will be a good dps) / Cloud of Darkness/Bartz
Cecil/Warrior of Light/Snow/Agrias/Vaan
Lenna (only in case the other units are too godlike to reroll)/Refia/Krile
Arc/Kefka/Exdeath/Tellah (This last one only in case the other units are great and you don't want to reroll)
All these have their use in the beginning and won't be worthless in near events. Of course there are other units we should analysis case by case, let's see his pulls.
Also, some great 4* or even a 5* but not the other very useful 3*, there is no need to reroll, they will come eventually in future pulls.