Do games from the forum count?
Also, difficulties definitely could use adjusting. Though I'm a relative newbie with just under 50 games behind him, I suggest the following.
> * Ambuscade is probably a 1 unless on Advanced and possibly even then, since one side of his advanced text does nothing in about half of matches. He spends so much time getting blank plays off of his Traps that it's quite uncommon for him to pose a serious danger.
* Gloomweaver is almost never deserving of a 3; again, his advanced text is frequently irrelevant on one side, and he often won't flip to the other side anyway, since he has an alternate win condition built in for those seeking to defeat him.
* Some particular matches should be adjusted based on how well the villain and environment synergize. Offhand, the ones that I know are likely to be worth a +1 are Omnitron in the Ruins of Atlantis and Akash'Bhuta in the Final Wasteland. Rook City is probably worth a +1 difficulty to nearly all villains (maybe a +2 in the case of the Chairman; all those extra villain card plays go especially far when you start out with ten cards in the trash). I'm tempted to say the same of Time Cataclysm and Tomb of Anubis, but I haven't tested those as often so I'll assume I was just unlucky.
* Advanced status is usually worth a +1, but there are some villains where it's especially nasty. I think advanced Kismet is quite possibly more difficult than regular Iron Legacy, for instance; she might be a "low 3" on regular and a "high 4" on Advanced, but I think it might be reasonable to bring her up to a 5. Citizen Dawn is another really mean Advanced version; she stays indestructible on her flip side much longer, and you have to leave the Citizens alone the whole time you're waiting for her to flip back, which with bad luck can be a very long and painful wait. I'd very likely put her advanced version on a par with those of the 4-diff villains, though her regular mode is definitely easier than theirs.
* It might, but I stress again only might, be appropriate to adjust difficulty up a point if you have only 3 heroes, and down a point if you have five. There would again be exceptions for specific villains - if they have a lot of H effects, they're probably balanced in all cases. Omnitron really suffers against 5 and has it easy with 3, for instance (his components-destroyed value isn't dependent on H, nor is the number of targets he attacks), but Miss Information is nicely self-balancing, with large numbers of relevant H values (from the damage she deals to the number of Clues needed to flip her). The Dreamer is a relatively rare instance of a villain that actually seems to be harder with more players (since the time needed to end the game is directly a function of H), and a few others might function this way as well, such as if they mostly deal damage in instances of H-2 to the highest HP heroes, rendering it easier for a single player to "tank" for the entire party.
* Ideally a comprehensive difficulty adjustment should account for the strengths and weaknesses of particular heroes, but such advanced analysis is certainly beyond the scope of a short-term project.
Regardless of whether these adjustments are made, I will definitely be participating. Probably only have time for H games in such a short timeframe, though. (As usual, H is a number from 3 to 5.)