Just one comment, UC3 is by far the one with less combat of all the pre-UC4 games. Look up the enemy count for each game.
It's pretty noticeable just from playing it, considering how much I agree with you in general this observation just stood out to me.
Unlike pretty much everyone the pacing didn't bother me in UC4, taking in the environments while hearing the banter between the characters was enough to keep me entertained.
I tend to avoid UC lttps like the plague and seeing a new one posted makes me roll my eyes because of how many there are but I'm glad I gave yours a read.
Now join us in the wait for Lost Legacy.
I would say as many like the pacing as dislike itif not more, looking through the game of the year voting and the 52 games in a year thread from last year and you will see a load of people say it's their favorite one and that they loved the pacing in 4.