1. The first chapter had an interesting concept on what happened before the 1st Sentinel mission. Attacking villages with strong naga is a great power trip and overall a good introductory mission. If you want this mission to be a bit more challenging, a bonus challenge is defeating all night elf bases.
2. Second chapter can be beat fairly easily, if you only go for the main objectives. If you are playing too aggressively, enemy transport ships can pass you and having a limit of max 2 transport ships allowed to pass, you need to take care, especially since the transport ships are faster than your units. I didn't attempt to destroy the enemy bases as an extra challenge, as it would have been annoying to try and not lose due to transport ships getting away and fighting with 3 enemies seemed like to much to me at that point. Although, battle with 3 enemies won't be avoided later in the campaign
3. Third chapter was a bit tricky with continous back-and-forth, with fighting enemy forces in their base and defending in my own, but luckily Illidan could handle his opponent and he didn't need a lot of help. It seemed to me that opponents always had more units with a possibly larger population cap, so attacking their bases was difficult. Once I've stabilized and taken the second gold mine, it became easier to defend the forward base as I was close to the enemy. Besides enemy's large numbers, they were quick to rebuild any buildings lost, so I couldn't chip at them slowly, but needed to attack fast and decisively. Once the first enemy has fallen, the second one was not that hard together with Illidan's combined forces.
4. The plot of missions was loosely related to the plot of original TFT campaign up to this point, but it diverged with coming of Tyrande and Malfurion to aid Maiev on Sunken Isles (I guess it diverged a bit earlire with the player defeating Maiev in front of gates towards Tomb of Sargeras in previous mission). This mission added an opportunity to train a single Naga royal guard, which was very useful and I like the decision of being able to have only 1 of that unit as I would've been overpowered if there wasn't a limit on it. The mission was really challenging, having us fight 3 enemies at once, this time without allies. I had to rush Maiev's base almost immediately after filling population capacity with combination of myrmidons and spitting lizards. With the starting 4 bases, this can be done easily. After rushing Maiev, I lost 2 of the forward bases and was fighting for dear life agains Tyrande and Malfurion, while they built forward bases where mine once were, a mechanic I really liked. With couple of back-and-forths one by one the enemy bases were beaten, but timing was very important as one enemy army can destroy you while you fight against the other enemy. Overall, the mission was very satisfying once everything clicked and it was the culminating mission in my opinion.
5. In the final mission the story gets a bit strange as you are betrayed by Lady Vashj. It's a dungeon crawl mission where you can obtain enemy bases, but they weren't necessary to win as the army you can get by freeing naga is enough. I liked that mission added a couple of extra units (mostly murlocs) that could be trained and it would've been fun to have them in a regular build-and-destroy mission, as I didn't need to use them in this mission. Concept of the mission was fun and didn't overstay its welcome. Dungeon corridors were a bit too narrow for chunky Naga units and 100 food maxed-out army. Boss fights were interesting, but not difficult even on hard. The mission ends with protagonist Lady Serpentra being buried by Illidan using Eye of Sargeras, which was showed in the end cutscene (epilogue).
The epilogue was from the TFT campaign and included Maiev which was a bit weird as we've beat her twice in the previous missions already and the ending is a bit anti-climactic, but I liked the gameplay of the missions overall.