I've played a number of Fire Emblem games, but I'm definitely not an expert. I've played every game that came stateside, save for Ike's games. I'll get around to those one day.
I'm pretty ass at FE games; I just stick with units I like unless they are genuinely shit, and I bench characters I don't like unless I feel like farming for their supports. I'm one of those retards that plays with perma-death on but resets every time a character dies, making me question why I don't just play the mode where the characters retreat instead of dying and are back for a new map.
I was cautious about starting Engage, because I wasn't liking the character designs, but I like it more than I was expecting. It's a big step down from Three Houses, but the gameplay is genuinely fun. I personally preferred the monastery to the Somniel, but neither are groundbreaking things that make or break either game.
The characters though, they fall between Awakening and Fates characters in that most are unremarkable while others are just one-note nonsense, so it makes it hard to be invested in them. Three Houses isn't Pulitzer winning writing or anything, but I liked a majority of the characters to the point that there weren't any playable characters I disliked (some could get annoying though, namely Bernadetta).
I rely a lot on Merrin, Panette, and Goldmary when I play. Yunaka was great when I first got her, but she's starting to fall back a little bit the closer I get to the end. Alcryst has a similar problem. I don't know what happened, but when he was unpromoted, he dodged nearly everything enemies would throw at him, but after promotion, it's hard to keep him alive.
The story is also incredibly corny, which is what I was expecting. I just finished Chapter 22, and saw the DBZ-style revival coming a mile away.
My main problems with Engage are:
1. Supports take way too long to raise. I know it was even more tedious in the GBA games, but the key difference is that Engage lets you fill out the entire support book, unlike the GBA games were you were only allowed 5 per character.
2. They should let you choose the 2 characters that fight in the Arena. While it is hilarious to see little Jean get walloped by someone 3 times his size, I still would like him to at least get better EXP growth by pitting him up against someone he at least has a chance against. Also, I find the Arena the best place to raise supports, so that would be an added bonus.
3. Cooking is bullshit. You should be able to do it more than once after a battle. It doesn't need to be like Three Houses where you could spend a whole day eating, but now I have loads of ingredients that aren't going to be used. Second, I hate the RNG of whether the meal will come out good or not, with the lowered stats as an added fuck you if it's bad enough. I notice that some characters seem to fuck up a meal no matter how skilled it says they are at cooking it.