Yeah Blue Planet is a newer campaign and it uses some of most detailed models available. Consider using the voice synthesizer(needs the latest 3.6.10 build) however as BP isn't voice acted yet and is pretty story-heavy, the plot twists during mission and Microsoft Sam is always superior to pausing and reading as that breaks the flow. Also don't get discouraged by the difficulty as BP is one of the hardest campaigns out there. I personally repeated a certain(you'll know the one) mission something like 15 time before finally skipping it.
Also a sequel to Blue Planet is in the works, currently being tested so might be coming out soonish.
I finished it and I wasn't too trilled with it. The story get weird and throw you around a lot in a deux ex machina way that feel a little out of your hands. Plus the order vs chaos thing for Shivans seem a little cliche.
And as you said some missions are quite insane. It's one thing to demand good skills to complete a mission, but when you have to rely on computer AI for some mission critical event it end up being frustrating if they make you fail. Plus some mission I only succeeded once I knew exactly what was going to happen and where I should be BEFORE anything in the game hints you to it. Add the fact that you cannot complete a mission with partial success and it's quite annoying.
The new models and weapons are well done however and everything else is very professional.