Yes, I've eaten tilapia. We don't have them in our lakes, and from reading what you guys are saying, I think that is a good thing. I bought a few from the fish market here a while ago. The flesh is kind of soft and the taste is nothing that spectacular. Very average. I won't buy any more. Maybe, the rangers want fisher-folk to take them home so they get out of the lakes.
The tilapia is a very popular fish to "farm" in ponds in Africa. They were even trying to raise them here in indoor tanks as a source of income and food in low-income areas. They are fast growers I guess and don't require a lot of food or space. I think that was the story anyway.
They aren't too good but in a pinch, they'll do I guess. If they are good enough, that may help other fish populations. Anglers can keep only (or mostly) the tilapia and release the native sport fish.