Only that the game is also not balanced on / for quick speed.

(even though that seems what a huge majority of the multiplayer community likes. And for some very valid reasons which are especially valid in competative multiplayer.
Perhaps one or the other cooperative multiplayer game at normal can be found if one really tries to get that one rolling and finds a like minded partner or 2. I for one don't much care for the number of games finished in a given time. But can well understand anyone who does.)
The Mod/ Game (depending on your preference of calling it.

) is really balanced for normal speed.
(even though the AI is not really good (as in not good at all

, since nearly unworked at) leading to what ecofarm discribes as "cheater advantage" for the attacker. Im sure that will change when the AI is really done. So the problem is not with the speed really but rather AI ability as of now.)
Thats also the offical guidline stated more than once up until now. (and its understandable that the team wants to finish the features first and then if possible balance it for the different speeds. Prevents alot of redundant work in vain.)
Overall Epic, Normal and Quick seem more or less playable (mainly depending on tastes.).
Marathon is just a chore (and i really like long games with lots of minigames and things to do so i should like it. But even for me its just to boring. Even Epic is borderline at times.).
Also since each civ is designed differently they all have game speeds at which they excell more or less
(Try Sidar on Epic to see. There they are just nuts up to deity. They perhaps are the most extreme in terms of speed-dependancy (or rather slowness dependency.

) since neither the ammount of combat nor XP-gain scales to speed as of now.) which is another reason to try normal where at least some kind of rough balance is tried.
Cottages are better at quick (due to much faster growth and build times.) farms seem quite hefty on epic and marathon (and near useless on Quick in comparison to cottages.).
So to completely answer which speed is good / best you have to say which civs you like and what strategy you like to use (slower is more interesting for builders quick rather for warmongers it seems. Normal caters to everyone more or less i reckon.).
I have heard once that in comparison to Vanilla, FFH 2 speeds are comparably one speed slower than their respective counterpart. Can't confirm that one firsthand (since i can't really remember my last vanilla game. Haven't played vanilla in ages.) but perhaps its a useful guidline for newcommers. (if it can be verified by someone who can compare on a first-hand-basis.)
Also if after those tips here you can't at all find yourself liking the mod as of now due to pace or balancing:
Consider shelving it for some time and get it if its really finished at ice phase (its still in beta even though its near the end) or at least all the main features are done (at the end of shadow phase 0.3x.) and more or less balanced. (perhaps around end of this year as a rought estimate.)
Else you may miss a real gem even by your standarts.
And if you want some real action (if that is what you miss

) get yourselves the "explorable lairs and villages" modmod found here in this forum on the first page and perhaps soon the 0.32 Version of it in the "Modmods and Scenarios" subforum.
There you are sure to not be bored by slow pace even on Marathon (normal speed still recommended but for other reasons... Unless you really like losing with passion.).
Don't complain then about having your but handed though.
Minotaurs, Wraiths and Elementals knocking at the doorstep in the first 100 Turns can really ruin one's day.
That one will really teach you to value the Archery-Line (sadly the AI can't handle that one very well (as of now) so higher difficulties are highly reccomended. Unless you want the game to be over before Turn 150. One way or another.) and defense instead of single minded rushes.
