Imho it is very good, especially in the beginning of each mission. Building up a new troop is also fine. But the end of some longer missions can be a bit tiresome.
However I think it's worth checking it out even besides of whether it's good or bad (and it's good): It's one of the very few games which actually offers a combat which works purely with tactics and almost zero luck. No to-hit chance, no crit chance, enemies always do the same after reloading. So in these tactical battles, you can spend a lot of time if you want to find the best solutions. Which is not just really fun, at least to me, but also shows how a good system without luck can work like.
