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I used them all! Then I put them in the third game. The result was amazing! I didn't have enough for all the castles, but I added some from Enin Brennan's repertoire. It turned out great! :)
At first, I didn't like the fourth game, but then I figured it out, and when things started to go well, and I got my first victories, my attitude changed, but not drastically. However, one campaign really impressed me. Dragons of Might and Magic. But that's the only campaign I liked. The plot is very good, with a hint of something more.
With the release of In the Wake of Gods, I completely abandoned the fourth game. As did many others, probably... It just can't replace Heroes 3. As a standalone game, it's very good... :D
Overall, my attitude is neutral. It's beautiful, but not always interesting.