The Skype android client
Is marginally worse than just shouting and hoping someone will hear you.
It likes to randomly disconnect, without changing its status in the notifications. It likes to not send messages, keeping them for a while so as to better make you look like a prat when the same message fills the screen three times.
It likes to display other peoples' messages to you only when you actually check, defeating the whole point of notifications.
Trying to leave a conversation to go back to your list of conversations doesn't work. So you hit the back button, which does work, but that also can drop you to the homescreen, so you need to re-enter the application to enter any other conversation.
The new "tablet mode" is unusable on a tablet, assuming you like seeing what other people write to you. Or what you've written.
Not totally germane to the subject, but that application fills me with rage.