It might be surprising but there ARE people out there who dislike (I don't like using the word 'hate' here since I didn't really hate it hate it) Kimi ga Nozomu Eien (shortened to KGNE).
If you're part of this minority, then join the club! (Literally) :P
Wow, yeah, there's nothing really similar between those two. Sure, they're both dealing with relationships and stuff but seriously, KimiNozo's characters are by far much much worse than NANA's characters are.