Oooooh, yes, you must rent them all! The end of season 4 is HORRIBLY shocking and next Thursday (the 17th! 9 days!) can NOT come fast enough! So quick! Catch up! I had to do the same thing just after season 4 started. I had seen some re-runs and really liked it and I started to watch it, but there were these new people and I HATED them! Because they were just...there...all of a sudden. But I rented the previous 3 seasons and watched them obsessively until I had caught up and I am glad I did. I love Booth and Sweets is so...sweet. Especially now that I know more about him. Still don't like Cam too much...
Sorry. Ranting. I'm just so excited!!!