Undesirability of immortality

Awaretheory shows that there are many different types of immortality. Some types of immortality are undesirable and some are not. Just like it appears that some life times of people are desirable and some are terrible. It seems that there are two factors at work first the desire not to die, and the second to have a good life no matter how long that life is. The religious concept of hell is one form of immortality that is not desirable. Most people would prefer to be dead permanently than to experience horrible pain forever. But the concept of pain can be replaced with any number of other undesirable experiences --- like endless bordom, depression, sadness, inactivity, envy, jealously or a combination of any or all of the undesirable experiences that can be suffered through. But just like life immortality can be imagined to be better than this. One obviously simple good form of immortality is taking a good life and repeating it over and over again endlessly. This good life would not be aware of the repetition any more than you would presently be aware that your life has repeated over an endless amount of times. We can also imagine taking out chunks of repetitions of this good life. Is this immortality if you only experience conscious existence intermittently forever or endlessly?