I fully agree. This is why I can't stand using Meebo unless I absolutely have to. The app itself is amazing for what it does, but in no way will it replace my dedicated desktop AIM client.

Most web-apps that emulate a desktop app are still clunky and nowhere near as smooth to operate as their desktop counterpart. Meebo is one example, and all the web "desktop replacements" are another. You're always waiting for something to load, or javascript doesn't resize the window properly, windows that get dragged around don't move smoothly, etc.