"As you can see from the stats linked above, Sedna is actually the weakest Demigod in terms of % of wins and the Vampire Lord is right in the middle."
Are you sure the Pantheon stats are reliable? I don't think the stats page works correctly (half of my games with my teammate show him being on the losing team instead of on my team)so I'd question the patheon page statistic as well.
Also, doesn't the Pantheon include AI in the god stats, what about rage quits, disconns due to players dropping etc and wanting to remake the game?
Either way, I'm a very skilled player (pro who gives pro tips) and I play this game alot (http://pantheon.demigodthegame.com/player/19297) and I love it to death. I NEVER play panthean because I can't match up with my teammates and custom games don't match me against AI. However, to say that Sedna is not overpowered is silly and means you need to log more hours or play better people. She heals, does 1k damage, has insane hp regen, and SUPER speed. I mean wtf, why does the healer have a 1k damage spell AND a heal AND the highest HP regen possible AND the highest or 2nd highest run speed in the game? And you don't think she's might be overpowered? Are you using Yetis? You know they're broken right (don't respond to commands), along with all the other minion AI in general (horrible pathing), you know this right? Stop using Yetis and you'll see how powerful Sedna is.
Additionally, there is no way a Torchbearer + Regulas should be able to beat a skilled team with Sedna or even Oak, so the original poster is correct in saying this is "unfair". When my partner and I want to win without question, we choose Sedna and Oak and roll the other team. (How could we lose with HoL shield, healing, 1.8k of instant damage, pent's debuffs, and super run speed x2?) In 2v2's you must have at least one support character, Sedna, Oak, or QoT, that's just the way the game works, being able to press the reset button mid battle via shield or heal is a huge advantage.
I don't want you to change the game because I enjoy the game the way it is and it's close enough to balanced, but it is true that some Demigod combos are not as good as others. I mean, TB + Regulas has soooo many problems: Where's the tank? Where's the "oh shit save me button" (don't say universal gadget or pots because that screws your econ waaaaay too much to be used as an equivalent to sedna)? Where's the interrupt? What? You went frost? Oh crap your dps is now half against a pair that you need to out dps a heal.
If there is any validity to the OP's rant, the only change I could think of to make it more balanced without borking stuff is to make Mark of the Betrayer apply it's damage prior to Sedna's heal going off and fix mode switching for torch bearer.
Also, using the Pantheon stats to justify hero power has another huge flaw in it. QoT is at the bottom. The majority of players have no clue how to use and abuse her shield + armor crush spike thing. In a well played (lagless) game where you can mode switch with impunity, the QoT will roll the other team. If the mode switching were made less painful, she would easily be overpowered. I mean c'mon...slow...armor reduction debuff....hp shield, but she's at the bottom of the pantheon? Either people don't know how to play her or everyone else hates mode switching as much as I do given the current bugginess/stun it causes and plays her only half way to her potentiial.