People are pissed because Season 2 of ZnS was exactly like Season 1 BECAUSE it seemed to just throw away anything built up in the first series. Like...there's no point in building up Tits McGee and Rei Ayanami if their backstories are never further explored and they show up for like, 2 episodes in the new season.
I love Shakugan, but yeah. That shit pissed me off. You are the most oblivious fucker ever, and when some girl tells you she loves you, you just kinda go "Hey, cool" and don't even acknowledge it? The fuck? At least be like, "Sorry, I'm too busy deciding whether or not I like this bitch who always yells at me and hits me."
Also, the ending sucked simply because Margery didn't get plowed hard and fast by Sato. Shit, he wasn't even in the last two episodes. Goddammit, that pisses me off so much. He needed to rail her, and nothing less would make me like the ending.