I got right close to the end from what I remember simply because I didn't have anything else to play at the time.
I'm a very gameplay-first oriented person and really don't give a shit about stories or characters outside of memorable designs, so I think if you're into stories and aren't too bothered playing a pretty average SRPG then you'll probably like it. If it's your favourite genre you'll probably love it simply because there aren't many of those these days.
I hear a lot of "hardcore" fire emblem fans (like someone mentioned earlier) saying it's the one of the worst in the series because of it's pandering to waifu related rubbish and dumbed down mechanics but then I'll hear other people who are obviously fire emblem fans saying it's great, so idk.
Gameplay-wise, Awakening has a couple of really badly balanced weapons (Nosferatu/Aversa's Night), and no ranking system to punish people who grind, alongside some DLC that makes grinding even easier. Exploiting those elements, and, even without grinding, using Robin's exp bonus skill, it's fairly easy to completely break the game.
Awakening also kept Shadow Dragon's/New Mystery simplified (well, actually, it's the original) objective system, where every mission ends after defeating a boss or taking a throne/castle, rather than going back to FE7-10's more varied objectives, like survival, escape and others. There are some optional objectives, but only in the side-story chapters, and, aside from a couple of exceptions none give big rewards for them, so they're generally just dismissed as irrelevant by the ones who dislike Awakening's map design.
Story-wise, it's also much simpler and smaller (as in, amount of dialogue between chapter, not the amount of battles themselves) than the last non-remake FE games (Path of Radiance and Radiant Dawn). It also heavily downplays the political/geographic aspects even compared to older titles by eliminating the narrator.
On the other hand, gameplay-wise, there's a large cast and variety of classes and skills, which gives many ways to play through the game, if you aren't going for the exploit mentioned above, especially combined to the generation system. The game by itself can be rather challenging if you don't grind or go for the Nosferatu exploit - the stats of your units and enemies are much closer than in FE8, an actual really easy title. The optional objectives in some of the paralogue chapters also could be rather well done at times.
Story-wise, it brought back support conversations, a fan favorite feature, in full force after they had been downplayed since FE9, reduced to generic lines in FE10 and removed in FE11. Well, FE12 was the one that brought it back, but still not in full force, and it was never released outside of Japan.
Graphically, the story presentation itself also is superior to any of the previous FE games (thanks to using the battle models for cutscenes, rather than just the map ones like in FE9 and 10).
There's also tons of fanservice for fans of the series. Bonus characters from previous games that can be faced as enemies or join the party(although they're limited in some ways compared to Awakening's actual cast), legendary weapons, mentions of legends referencing previous titles, etc. Gameplay-wise, those features, alongside, the character, class and skill variety and some minor other extras like the daily barracks events, merchants and monsters spawns, also give Awakening a certain sandbox structure that's pretty much non-existent in any of the other games of the series (even the ones with world maps, Gaiden and FE8).
However, in a way, that goes directly against Fire Emblem's standard game design, that was always very direct and giving little freedom to the player aside from unit choice, with everything, from item availability to enemy strength, specifically balanced around that. With Awakening though, at any point you can get more experience, items or even units for your army completely unrelated from the story chapters. So, you've got some fans welcoming all this content as a pleasant addition to the series, while others dislike it and want a more focused experience again, generally also arguing that Awakening's balance problems exist due to its open nature and that it needs to be removed from future titles to bring back balance.