I don't doubt that.
I watched TFA three times in a row the other day, and each time it felt a bit more like ANH retold.
I was just weak. Like weaker than Taegin in the Force.......oh, hi Taegin.
This is the easy one. Everyone has asked this. The last person R2 was with was Luke. When Han was killed, and all the planets were destroyed, Luke felt it through the Force. Then also through the Force he activated R2, but because of the distance that his thoughts had to travel, R2 didn't wake up till exactly the right time for everything to be convenient. It was Luke who told R2 to wake up, and give them the map. He realized that it was time for him to come back and help defeat the new threats.
Then why, with his interstellar Force abilities, didn't he simply sabotage SKB on a FUBAR level and wipe their forces out, and therefore saving the galaxy?
I want to know your answers to the first 2 questions.
1) Stereotypical bad guy tactics, underestimating the hero/heroine. "It's just one little girl." Despite KR knowing she was Force sensitive with powers on the rise. Derp-eh-der. How the Republic couldn't fight these idiots is yet more proof of how epically poor the script was.
2) They used a map. That was easy. Same basic principle as charting a course through hyperspace.