Actually, it depends a bit on how you view it. From the people who have played the SNES Fire Emblem games, the GBA era was a letdown. The SNES Fire Emblems had most of what the GC/Wii Fire Emblems had, but that was removed from the GBA installments.
To them, the GBA installments were the same letdown as you find the DS games to be. The Fire Emblem handheld installments have always been inferior to their console counterparts in terms of complexity.
And let me assure you: Fire Emblem 3 is nothing like Fire Emblem 1. Mystery of the Emblem was superior to FE1. It's more advanced gameplay wise, and it actually has a story. Mystery of the Emblem is still a good game by 2010s standards, whereas FE1 is appalling.
Most of your complains were most likely fixed by FE3. They will, thus, also be fixed in the remake.
Having played FE3, I can say that I greatly look forward to FE12, and believe it will be far better than FE11.
I'd rather have had an FE5 remake, but I think that part of the reason they're making FE1/FE3 is that Marth has become a liked character in the west through SSBM/SSBB. That increases the chances of the game selling, and Fire Emblem really could use some more sales.