I found necron boring because all i did was attack/shock/phoenix and he was dead.

I found bosses and battles in FFX alot more engaging because could swap chs, chs had in-battle character (if you know what i mean), and you actually used the abilities of your characters to do stuff. The optional bosses are good in FFX (although a little insane), such as dark aeons but the final bosses are crap, I mean the last real boss is seymour and hes not very dramatic, I just found the whole FFX battle system more engaging and hence more fun.

Although, i played FFX before FFIX, and then i played FFVI (in that order), battles, esp bosses in FFVI have to be some of the best. Mabey i just like FFVII bosses because of cool music (and nostalgia, FFVII was my first final fantasy (oxmoron))