Depends on your definition of 'not right'. Jumping between half a dozen web pages and various open apps, media player playing back stuff in the background and youtube to top it off DOES adversely affect response time, but I'm not sure what people expect here, youtube (flash, to be more precise) can do that alone on a full-blown netbook.

IMO What you see on the video as unresponsiveness is not a capacitive/resistive press harder thing, but rather the N900 swapping in and out the various pages/apps (if it was just presses, the task-switch animation would be smooth).