The Iced Tea is unsweetened, and made in bulk; the lemonade is weak at best, but unlike Disney, RCL actually uses ground coffee (Barnies) to make its brew -and it is quite servicable. Judging from the brown cloud that comes out of the machine every time we drew a cup on Disney, they use instant or freeze dried to make theirs.
If you're into tea or lemonade, I'd suggest bringing a box of Crystal Light packets and making your own.
Thanks. I prefer the unsweetened ice tea so if it's not great maybe I'll just get a tea bag and wait until it cools down. At least I'm prepared now. If I like it I will be pleasantly surprised.