Even without those unneeded and mildly frustrating tutorials (use the attack button to attack!), the UI is pretty much self-explanatory to anyone who passed kindergarten. At the very least, a few minutes of playing around should be more than enough to have most of it figured out. And this is what we have: a good UI.
Now people who design custom maps have most of their work cut out for them, as they did in sc1. The UI is right there, no special meddling required and it works just fine. But having spent some time on sc2 b.net, I now understand that UIs need to be difficult to implement, so that people who don't know what they're doing won't screw it up and we won't have crap like this at the top of the ratings:

And I know this isn't a UI. But for goodness sake people, were you high when you designed this? Friends don't let friends photoshop when they're dropping acid. Please. You make artists weep. This -- with a very professional and well done logo. WHAT THE CRAP. Anyone who looks at this should jab that cancel button right away (which is finicky anyway) and not look back.
For the good of you grand people, I pressed further into this "magical" game which the top reviewer claimed, "This game is the best thing to happen since penis."
Well Mr. MeoW, I think your ability to judge a game is about as good as your ability to use sentences. But okay, what makes this game so great. I had a look:

I have no bloody idea what's going on in this picture. What are all of these buttons and gizmos? WTF do I fucking do. Well this screams bad level design, I'm forced to return to the topic of the UI. Would anyone playing this game for the first time have any idea what's going on? No, I don't even know what the units are doing because instead of having an explanation of what the unit is, I'm left with a dumb acronym and a bunch of D- rate garbage filler of some teenager trying to be funny.
And keep in mind. This is THE top rated game and has been top rated for some number of weeks, perhaps months. There is no excuse for this trash. I am mad, because this person is clearly not trying to design a game, they're trying to encourage game designers to lobotomize themselves.
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I mean at this point, I know there's a review section, but it's too poorly done. Which isn't your fault Blizzard, but there does need to be a system where more quality reviews can be read and rate things better. When the top reviews are snappy one-liners without any real critique or substance, that's not a reviewing system, that's a /b/ circle jerk.
Thanks.
None.