Well, we actually had two episodes with Poseidon. In the season 5 "motherhood", we saw him try to harpoon Xena, Gabrielle and newly reborn Eve. Instead we saw him die at the hands of a wicked warrior princess' backhand when she diverted the godly blasts of Hades and (?) Demios into Poseidon's chest.
But for a "real" ep, we need to look to the end of season 2's The Lost Mariner, where we see the form of Poseidon stand before Xena and her shipmates as he tries to bribe her to leave the cursed ship. Later we hear him try to bribe Rama the lost mariner himself, to turn Xena over to him. That time he was just a voice and a green glow in the night time ocean to represent the god. The final interaction at the whirlpool in the day was just his voice.
I thought I already posted this, but actually its a "part II".
ETA
I see your point, except we have to remember that Sean Connery was Scottish, George Lazenby was Australian, Timothy Dalton was Welsh, and Pierce Brosnan was Irish. In that vein, you need to remember that our Warrior Princess is a New Zealander, and Cate Blanchett is an Australian.
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Lucy's natural accent! 
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