The weakest castle in Heroes of Might and Magic IV!

I don't really know... I'll try to reason like a complete newbie, but here goes. For some reason, I sailed through all the Campaigns for the Humans in all the expansions and the original game without any problems. But with other races, I get stuck after 2-3 maps, and then they just get crushed like noobs. I really liked the Champions. First Strike is one of the most useful skills, in my opinion, in Heroes 4. It lets you feel much more secure. True, it can be cast massively for a tiny amount of mana by many spells... Angels didn't really impress me =). I don't know... I didn't find any weak units at all. Not a single one. That's a good thing. Squires can at least stun... Archers, of course... Pikemen with Retaliation can often be used, ballistae are good in sieges, etc. In other races, I noticed some units that are never used... Death is a prime example. Imps, skeletons, ghosts, even cerberi - I rarely used them in battle. That is, in battle, the enemy may not even worry and can switch to, for example, only destroying vampires or devils/bone dragons. This is not very good. Chaos is certainly strong, but rogues are rarely used, orcs... Medusas are good here, the other units are also decent, but of course, the Dread Lord is excellent. Order... I don't know why, but it seems to me that halflings are the most powerful unit among all other level 1 units. I know that their damage is 1-2 and their health is slightly more than a sprite... but somehow there are many more of them than the others, and besides, they are also killers. I like all the units in Order. Dwarves are good for finishing off. I don't like Might =). So, from everything I said above, I'll conclude: I didn't say anything new for fans of part 4, I just stated a couple of facts from the point of view of a newbie, if you want, a beginner in Heroes 4. But for some reason, for a beginner, the Life Castle is not the weakest, and Death seems just pathetic... P.S. I played in Equilibrium, one of the latest versions