Am I lucky or unlucky?

Unlucky..
play around 1,5h a day
Got 3-4 kings rock. 2 metal coat, 1 dragon scale, 2 upgrade.

However nothing the last 3 weeks and no sun Stone

No idea, but you're on par with me at least. I play an hour a day or so and I've gotten two king's rocks, one on a 7 day, and one metal coat so far.

I have 5x metal coat and 1 sun stone, I don't know why I am getting always the same evolution item...Want my upgrade and my dragon scale.

I have got my special item only on normal spin not on the 7 day streaks. I have got 2 upgrade and 2 kings rock and one metal coat.

2 updrade, 1 metal coat, 1 kings rock, 1 sunstone

Been playing multiple hours since Gen2, only have a Sun Stone from the 7 day streak so far. Apparently I am unlucky compared to others.

I got 5x Kings Rock and 4x Sun Stone so far... oh and one Dragon Scale.

Weird, and what I really want is lots of Metal Coats cause I got a bunch of Onixes and Scythers ready to evolve. Also 3 more of high IV Seadras and 2 Porygons.

I got not enough Oddish / Sunkern candies and no good enough Slowpokes ready to evolve. How ironic is that?

They stopped giving out evolution items on 7 day streak. Now it is just random.

I've only gotten three evolution items so far. They are pretty rare for me and I have a pokestop I can spin from my living room.

3 metal coats. Lots of spinning.