Sometimes I find a interesting looking Sefer (I know...I know...don't judge a book by it's cover) and want to take a look at the content. To my surprise, there are many Haskamot (approbations) from Rabbanim that I've never heard of. Who is the most "accepted" Haskma for a Sefer nowadays? (please no opinions, but logic)
ISrael:Reb Ovadiah Yosef, Reb Eliyashiv, and Rav Kanevsky,Rav Shternbach ,Rav Abba Shaul
America: Rav Belsky, Rav Feinstein (either one), Reb Shmuel Kamenetsky
Simply put these Rabonim have name recognition and not anyone will get a Haskamah from them but sometimes you have to read between the lines if the Haskamah addresses the contents or the Author saying I know him to be a good man that is a warning sign sometimes they will Humor the author for other reasons.