[Maédhros]

First, I want to reiterate that when I refer to the Valar, I mean Manwë.

, What does this have to do with the Valar inviting the Quendi to Valinor?

The problem that inviting the Quendi to Valinor is that it was almost unthinkable that an elf who saw Valinor would want to remain in ME. (Exception of Elwë.) Because Valinor was so much beautiful than ME, it would be logical to assume that most of the Elves would be willing to go there and forsake ME.
My reasoning is this:
If the Valar had not summoned the Quendi to ME, they would have been more involved teaching the Elves in ME and therefore helping to heal the wounds inflicted by Melkor. The elves would have grown in ability and wisdom by having that contact with the Valar. They would not be as "great" as the Caliquendi but would have been better than the Moriquendi.
When Melkor had returned to ME, the Valar would have realised that the Elves could not defeat Morgoth by themselves and hopefully would have intervened a lot sooner, erasing great years of pain to both Elves and Men in ME.

Are you going to criticize Manwe's decision?

I will criticize Manwë's decision because if they held Melkor as a prisioner for ever, as they did after the War of Wrath, a lot of hurt could have been prevented.