i agree that "unreliable" isn't a good term for the transport. reliability is a property of the system, not of the transport. and you can make an unreliable system with TCP or a reliable one with UDP

but, "best-effort" implies that it's doing some effort to ensure delivery, when it's really dropping any packet that looks funny or is unlucky enough to hit a full buffer

i like "lossy", but this is definitely one of the two hard problems