Just beat the game. I played on Hard/Classic. I did not play random skirmishes nor the DLC, but I did play the first four Paralogues and 3 extra Paralogues.
Impressions:
PROS:
Pair Up/Dual Tag - This mechanic really shakes up the game and the strategies. By the end, I had everyone pairing up. It added a lot of tactics for offense, defense, and even movement/positioning. The game plays like Fire Emblem: Double Dash.
Relationship Gameplay - Intelligent Systems had the stated goal of building relationships, and all of this is very well integrated into the gameplay. From pairing, tags, support bonuses, multiple attacks, and support blocks, the theme of the game becomes the way you play it.
Streamlined Compilation - Much of what worked well in past Fire Emblem games is here and easy to use and understand. Branching character upgrades, skills, the preparations screen, the shopping, etc.
Support Conversations - Many of the support conversations are well-written and bring a humorous and new look to the characters.
CONS:
Difficulty - My biggest complaint is the difficulty. Even without grinding and only by playing 7 Paralogues, I breezed through the last few missions with few problems. Hard seemed to offer a fair challenge at the beginning, but the leveling is insane in this game. I didn't even abuse tricks like Nosferatu-tanking either.
I was maxing out 20/20 characters and then reclassing way more than I ever reached 20/20 characters in past Fire Emblem games with fewer chapters. Maybe I broke the game for myself by playing 7 Paralogues, but because you're supposed to recruit characters, they seem essential to the experience.
I don't know if it's because of the growth rates, the overpowered characters, the goal of making the series more "accessible" or the fact that characters can now level without being in battle themselves (through pairing), but this actually makes the late game easier than the early game, moreso than any past FE game I've played. For a game that hinges on strategy gameplay, it's unfortunate that the late game gets significantly easier.
Story - The narrative is simplistic, yet overly convoluted. It's classic poor video game storytelling. But even by Fire Emblem standards, it falls short. The villian(s) are not as interesting as Sacred Stones' nuanced Lyon character, and any interesting political overtones from Path of Radiance or Radiant Dawn are completely gone.
Hammering You Over The Head With The Theme - While Intelligent Systems is great at integrating the theme of friendships/relationships into gameplay (form and content), the writing is awful. You're frequently left with bizarre quasi-homoerotic dialogue like:
Chrom: We're friends!
Avatar: We're friendier than friends!
Chrom: I love you.
Rather than using subtext to imply a growing friendship, the writers just choose to blatantly have characters talk about being friends way too often.
OVERALL:
A great Fire Emblem game with a new innovation of pairing based on the old support system. I wonder if the series will continue on like this or if Awakening will truly be the Double Dash of the series.
The difficulty is all over the place, but hopefully IntSys can refine this as they get used to offering all these new options like a world map, random encounters, optional sidequests, DLC, Classic vs Casual, and four levels of difficulty. Still, the refinement of past games with finite EXP is missed.
Unfortunately, video game storytelling is still shit, even for games that spend a lot of time on story. The characters have some nice interactions though, and nothing takes itself so seriously that this can detract from the experience.
I'd put the game under Path of Radiance and FE7 (nostalgia?), but above Radiant Dawn, Sacred Stones, and definitely Shadow Dragon.