Yes there are many good projects that failed, I don't bother cramming the names since they failed already, this is why crypto investment seem like gamble sometimes, its always wise to have many promising altcoins in your portfolio because not everyone of these altcoins will survive even if they have the best features
Sometimes we are also wrong in interpreting or evaluating projects, because a failed project is a project that is not good, because a project that is really good in general will not fail, because the team is very concerned about the project so they are always looking for solutions to make the project become success.