Not if you factor in all the residual. Adding to fossil or water based grid is okay, running on its own with all the necessary residual it gets way worse.
Yes, even if you factor in "all the residual".
EROI cannot be bad, since energy is only a small part of the cost of manufacturing. If EROI was unacceptable, then overall cost would be too.
EROI of 5 means 20% all energy goes just to preserving current status. As wind is limited this gives hard limits to what is sustainable in northern countries. These problems completely disappear with nuclear.