New ubuntu 11.04 works poorly

Hello
I don`t know what`s happened, but new Ubuntu 11.04 is completely useless. I log in to Ubuntu classic, because this new desktop offers me things that I don`t want, but:

* Sometimes system begins to run very slowly for ten minutes, and memory usage is less then 46% (I have 1GB memory)
* I need to wait for three minutes to break the screensaver mode when my screen is locked. I move a mouse, and Ubuntu asks me for password in three minutes
* Sometimes everything disappears and I see some messages, white on black, and then the login screen. When I log in I can find no document saved (and also no message that something is wrong)
* Libreoffice in some cases adds an empty page at the beginning of a document, and neither undo helps
* 90% of time Skype is not present in a tray area while it is running, and I see some messages that contacts are online or offline
* It is very hard to find a place where drug&drop works. With every new release I find less and less clicks that Ubuntu understands. In this 11.04 release it seems to be more stupid than Windows.
* Desktop effects disappeared, and disappeared the whole tab with setup of it.
* Now new feature: Firefox shows only one tab while I have more. Though, I can jump to the next tab by Alt+Tab.

As a result, the system is completely useless, I have no possibility to work, the only thing I can do is to download another Linux. I am not sure if Ubuntu users are looking forward to feeling such an opportunity. What`s wrong?