I just played Sera mission 1. I played on hard and it took me 45min to fully destroy the base. (nothing happens after?)
I realized how dependend i am on consistent intel. Multiple times I found my units to be too close for confort and sudden pop up of a million radar blips were there was nothing 1 second ago. Sudden loss of intel felt very random and almost bug like. There probably is a reason regarding frigate/destroyer radar differences(?).
Most air units felt quite useless as i repeatadly lost them by a couple of patrolling janus. (my air micro with 4 swiftwinds is pretty bad apparantly)
I was able to use the gunships early on though to counter full frigate patrols (using 10+ gunships)
In my second attempt on hard i did it in 35min.
I still had the issue with seemingly randomly units popping up out of nowhere and vision appearing and disappearing.
In the end i felt that I needed atleast 2 cycles worth of units to accomplish anything:
example at least 8 fighter to fight of the groups of janus
at least 10 gunships to some damage against navy
at least 6-8 torps ...
This meant i had to keep all my air safe in base before venturing out and if i lost focus for a second 5 janus would fly in and kill half of the air units patrolling....
Maybe thats merely a micro short coming from me, but it ended being quite annoying.
In the end I had some troubles with lingering air on top of the base, harassing my navy ( i lost all figthers against janus + static aa)
This meant i had to wait a long time for units to spawn and cross the water to get were i wanted them. And again 2x, cause 4 fighters werent gonna stop 8+janus with gunships to soak damage. (Don't know how to micro that)
Advice/Tips/...
If possible i would like a ping or a sound indicating that we got more units, frequently i would forget about them and have some air+navy pile up, but that is mostly my own problem :p
Maybe make 2x amount of gunships and no torp bombers when there is no naval factories+naval units any more?
PS: Astrofoo: what sonar are you talking about? Was there sonar?
PPS: Zappa: There is no T3 seraphim sonar, so obviously you can't upgrade it? + that underwater base needs to be put on land again