Just seen it, loved it.
I really wasn’t expecting a huge plot, and there wasn’t one! The fact is that while many scriptwriters can handle an original and interesting plot enough to fill one film, very few can cover three - that takes a real genius. The Matrix had the interesting plot, the philosophical theory, and spawned all the debates. Reloaded and Revolutions were purely there for the entertainment, in my opinion.
Action in abundance! The battle for the Dock was one of the best action scenes I’ve seen in a long time. There were lots of good “oshit” moments as yet another wave came in, each bigger than the last.
Excellent special effects
I love the way that with all that technology the best way of reloading the mechs was a wheelbarrow filled with ammo crates, and a guy content to run very fast… Or that while an EMP would end the battle, they didn’t think to install one in the Dock… Or that they have EMP technology but neither the machines nor the humans worked out how to harden a system against it… Or “Sentinel”, aka “killer-mari” 
Good fun and an enjoyable couple of hours. But yes, bring on RotK! ;D