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Parts 1, 2, and especially 3 are excellent.
Part 4 is not very good. The units and buildings are very small, and there is too much detail overall, and it's all very tiny (it immediately made me want to play the second game with its larger characters). Also, the Haven faction is clearly superior to the others (especially the magic of the genies).
The fifth game is slightly better than the fourth. All the objects are larger, and there is a good storyline. I would say that the glitches when going through underground levels, the reduced role of magic, and the increased role of melee combat (balance is needed:), the excessive number of hero skills (in principle, this is not bad, but if you increase the campaign by about 10 times), and the reduced role of artifacts are drawbacks.