That's generally my impression as well. (sample)

The 9-11 Research page related to this lists the same article I linked to as the source for the gas station confiscation story. Strangely, the page linked to as the source of the hotel confiscation story no longer exists, and I've been unable to find any mention of it on the parent website ("Unanswered Questions").

Edit: I can't speak much for the validity or stance of the website, but this particular page contains some results of FOIA requests about the tapes. Both the FBI and DoJ state that no tape was confiscated from the Sheraton hotel. The DoJ confirms that the gas station video was confiscated, but that it doesn't show the impact.

Second edit: Although, seeing this picture, I just can't understand how in the bloody hell these CTists seem to think a security camera sitting on the roof (meant to monitor a parking lot or something, I assume) could possibly have a view of the impact. Actually, can anyone look at this satellite image and tell me exactly what a security camera on the roof would be looking at, especially on the Pentagon side (image)?

Seems to me the idea that the Sheraton hotel had a great view of the impact is just another factoid.