iam getting fire emblem SD, but should i get Knights in the nightmare, how is this game compared to fire emblem (series)?

Dude, don't get Shadow Dragon. I LOVE Fire Emblem, but that game is terrible. The story and characters are absolute garbage. The pacing is horrible and it's way to easy. I think I ruined the game for myself, though.
Before I started my first playthrough, I saw an option for Normal and hard, so I chose Normal. I didn't realize this mode was the SUPER FREAKING EASY one. In Hard mode, there are 5 different categories, lol. I should have chosen the 3 stars in hard to get a better challenge...but it's too late. My gamefly expires in 4 days and I am not going to play through the game again. I got through 9 hours of "normal" (effing easy) mode, and I just couldn't bear it. It's way too easy and limited to the other FE games. I just played the first 5 mission in RAdiant Dawn for like the fourth time and it was still TONS better than SD. The graphics in SD are also terrible.

Sorry about the rant. It's just that I love the series so much and I was incredibly dissapointed by this one. I can't stress enough how important it is to have good story and characters in this series. Who wants to play with generic people you don't care about?
I seriously can go on. If you want me to I could tell you what else I didn't like about this game.

Fire Emblem: Shadow Dragon is not your typical Fire Emblem game. Rather, it is a remake of the original game released 20 years ago. If you are used to Fire Emblem on GBA, GC and Wii and want it because of the story, you will be disappointed. If you want Fire Emblem: Shadow Dragon for some good hardcore turn based strategy gameplay, then you'll enjoy it. Oh, and this game can still kick your ass even if Hyperion played it on normal.

Personally, I really liked Shadow Dragon, as I really don't care about story much and rather I enjoy good game play.

As for Knights in the Nightmare, I just recently heard good things about it, but I know nothing about it really.

Yeah, but... Shadow Dragon is awesome too... ;) I bought the special edition and the art book is... /drooling