Canon was first or early to market with USM lenses, IS, full frame digital, and broadcast quality HD video in DSLRs (contrary to your claim about video). They are generally ahead of the curve on sensor design and new sensor introduction. They are clearly ahead of the curve when it comes to lenses and lens design. (Nikon being a close second. Nikon fans who would argue this need to take a close look at release dates for difficult glass like the T/S lenses.)
Dust reduction - First canon denied it was needed, but eventually it came in canon DSLRs
They denied it was needed, or merely weren't first to market with this?
IS - when in body IS came, canon dilly dallied, and then started giving a kit lens with IS
Canon has always had kit lenses with IS, dating back to the 28-135. The introduction of IS to the cheapest kit lenses only came with their new, easier to manufacture IS mechanism. Are you complaining about the time it took them to develop this, a project which probably started years before anyone had in body IS? Or about the lack of in body IS?
Similar story? If Canon was behind on this then how come the film industry went nuts when the 5D mkII arrived?
And now continuous AF in video. Panasonic does it, Nikon started doing it. Will canon start doing it? You bet. They will, but only a year later.
How late was Nikon to full frame? How late is Panasonic to a larger sensor? Or to any of dozens of Canon lenses they have no equivalents for? If Canon is behind, why have I been shooting an 18 MP sensor for a year now while Nikon DX and Panasonic were stuck at 12 MP?
You can't expect Canon to be first to market and best in market down to every last feature, idea, and detail. Other companies are going to get some firsts. But Canon has their own list of firsts, many of which are more impressive than the things you list here, and they are arguably the most well rounded company in the small format market.
This is my biggest grouse with canon. I have invested into the system for its strengths. The pizza base is very nice. But canon, please give us some nice toppings too!
While my 7D is weather sealed, I don't want pepperoni any where near it ;-)