1) It doesn't create / tags automatically. This can help in some cases, but in most cases it only disturbs.
2) It makes article loading too long.
3) JCE can compete with TinyMCE and some others, but ceditCKEditor leaves it far behind, not because of features, but because of look & speed.
4) Too many features, and too much time to find the one needed.
1) What tags are you referring to? JCE creates well-formed XHTML valid html.
2 & 3) It seems strange that your main requirements of an editor are speed and visual appeal. The loading speed of JCE can be increased by activating GZip compression in the JCE Configuration.
4) I agree, JCE is packed full of features, and offer even more with an optional subscription. Sometimes its necessary to spend time to learn how to use an extension to get the most out of it.
It is a great alternative for vBulletin, phpBB or even IPB, of course, if you have several additional Joomla! components installed.
KUNENA & CCBOARD RULE!
But I think that authors aren't very attentive when they use it on their sites. I think they could write descriptions of some functions fuller and name these fuctions better too.
* many plugins for it are paid
* many free plugins are... hm... bad...
I thank authors a lot for their work, but I still prefer sh404SEF.
But! For simple sites without forums, directories but with lots of articles and pages this plugin is MUST-HAVE!