Was it bitter? Sometimes a particular variety, especially if it's "one in the works" can throw a "bitter" gene. But for you to have all of your varieties taste bad, I'd say you have a soil problem. Were they bitter, or lacking in taste/flavor? IF the latter, it may be that you picked them too early, or did not allow them to season before eating them. Winter squash is best if not picked until dead ripe. You can tell that b/c the tendril closest to the fruit will be dry and brown. Then, you should let them sit in the sun for a while to toughen their skins, and develop their sugars. Some squash do not develop best flavor until way into the winter months. Squash are heavy feeders. If you didn't give them adequate fertility, that would affect the flavor.