To be honest, I really liked Endgame, despite certain...er...events.  Why?  I think mostly because my biggest fear was not that they would kill off Connor, but that the writing would be such that he would not be the character I've come to know and love.  But, thanks to whoever crafted it and, I'm sure, CL's guiding hand, Connor was Connor.  And somewhere deep inside of me I can somehow understand (though not necessarily agree with) how Connor came to that low point, and why he made the decision he made (for sacrificing himself was, indeed, his decision).  Anyhow...flawed as the script and editing might have been (though not as bad, certainly, as it could have been), I enjoyed the flashbacks, the further tidbits of Connor and Duncan's relationship, and seeing my boys on the big screen.

Here's what I've got for you regarding Highlander:Endgame:

Connor's Thought Processes: An Essay

Alternate Ending #1 -- before I saw Endgame

Alternate Ending #2 (also pre-Endgame viewing, but closer to it)

Endgame fanfic -- "Sanctuary"

Endgame Fanfic -- the alternate ending I swore I wouldn't write: Mind Your Ps and Qs Endgame Fanfic (short this time) -- The Letter