The simple answer to your question is no. Having said that some academic/non profit sites make their logs openly available, but as a general rule if you are looking to view competitors stats then you are out of luck.
To get a peek at some Alexa info without installing any toolbars, use metaeureka [metaeureka.com]. On the SERP, there are two features that might be of interest, 'Site info' and 'Alexa info.' As NFFC mentioned, this shouldn't be considered particularly accurate, but it might help confirm data gathered by other means.