Dragons don't appear frequently in my game. Besides, they don't spoil the scenery like those horrible Oblivion Gates.
This, i hated seen red sky and creatures coming from the gate attacking me and even if you wanted that gate gone you had to go in spend 10 min till you close it and than go out
While with dragons is like this:
1.Dragonend shout ( to force him to land)
2.Use 3-4 power attacks
3.Take his sould
A less than 2 min job, so yeah dragons do no bother me even a little plus i like to hear the voice when they are flying around it really sounds cool.