currently in a big MP game I'm playing as pythium I'm losing badly to caelum in mid game phase. This is because I failed to counter their strengths- mobility, seraphs (quick+ lightning / quick + false horrorX4), and SC air queens. I think Caelum is very strong, but every battle I lose prompts me to some hard thinking. Not only what I could do differently in that battle, but also what I could do differently at previous turns to have been in an advantage.
I think Caelum is a very strong nation. But I really mislike the nerf direction. Mainly for two reasons.
First, in dominions I've learnt that for each good strat/nation/combo there is a counter. And secondly because Caelum is a unique flying nation ruled by mages. This is their theme and flavor, I do not want to see them nerfed.
Truth is, I have a very bad experience from other MP games in which the nerf this and nerf that cries have led the developers to equalize all races (see AOW-SM)
edit. typos.