Exactly. While it was only 12-13 episodes long, it also had the amount of information appropriate for its length. The remake, on the other hand, while far better to look at, had some downright horrid pacing, making Monster and Legend of the Galactic Heroes seem like they have a fast-as-hell pace in comparison. It contained nearly as much content as the first anime and had twice the length.
Most of its extra time was actually alloted to 'character development' like Ayu saying "Uguu" twice as much, Makoto trying to prank Yuiichi twice as much (and failing), Shiori asserting her liking for ice cream twice as much, and Makoto doing these dumb 'karate chops'.
That aside, if you don't like horrid art and shitty pace, it's best to skip both Kanons altogether.
Also, AIR movie is good. Because it cuts through the fat and instead portrays the core of the game's story.