Would they think our everyday quality wine is better? Would we think their best wine was better than our best wine?
Ancient wine is apparently pretty unpalatable by modern standards. I can't imagine drinking wine with resin, marble dust or burnt grape seeds or other ingredients that were meant to keep wine from spoiling. Nor can I see seawater as a pleasant mixer. Now as for them who could say. My grandad drank stuff that tasted like herbal kerosene to me but he grew up on it and loved it.