I just noticed how scary Veno's movement sounds are. :I
I also think selecting (other) units (than your hero) is a pain compared to even wc3. I mainly miss having mouse button 4/5 to cycle through units (or does tab work? (on the other hand I have to admit that I have been using a 3 euro mouse for over a year now anyway which has only 2 buttons and a mousewheel, so it wouldn't matter that much for me anyway. Though the tab option would be nice though)). For some reason I have problems controlling the other (fire/storm) pandas as well as necro spawns properly since dota2, as it sometimes takes me up to three or four attempte so select the proper creature. Some of my friends have been complaining about this too, and I can imagine this could have a serious influence on someones (future) Meepo performance... I remember cycling though the copies with the net was awesome!
(P.S. Has anyone been playing dota1 recently? Skywrath Mage + Legion Commander is some boss ult combo. o.o' Can't wait for them to be implemented (though they will probably be nerfed anyway)).
Edit:
I generally recognize the ult by it's green glow instead of the raising of the arm as I generally antipick SK for my team (most stunners/silencers should do the trick) and lurk near my team dedicated to scout for a hidden SK powering up his ult and hopefully interrupting it in time. I think SK generally needs to be counterpicked as Pipe simply doesn't absorb enough damage unless it is combined with a meka or a (few) bkb(s). And even then the SK ult is often backed up with a Krob/Tide/Enigma ult so I would argue that specifically counterpicking SK is rarely a bad idea.