Tactically deepest TBS RPG ever? i played kings bounty. It was good, very good. But not the best ever or most anything ever.
and oh sweet jebus, if the combat was like xcom apoc...
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But ugh, huge battles with thousands of troops would be ugly in xcom style. Take forever to do anything. 
Perhaps there could be special situations for xcom style, like combat in castles and such or fights between small/elite units, but when i get my 10,000 zombie army going, i don't wanna have to issue orders xcom style. unless you could somehow have squads set up in that style.