You're making an error in assuming that the Tellius games are the norm for the series. There's a good case to be made that each Fire Emblem game has a specific area it focuses especially on, and the only ones that have serious emphasis on the characters are Genealogy of the Holy War (FE4) and FE9.
Fire Emblem is an RPG that is very light on text. The simplest way to introduce characters without a lot of text, is to introduce them with a stereotype. The series has even introduced its own archetypes that later games follow.
You draw a lot of conclusions about what a "proper" Fire Emblem game is like, but most your complains have already existed in previous games. Stereotype characters have been the vast majority in every game, with something of an exception of the Tellius games.
The "hard to get" pair-up mechanic shares its low percentage game-altering mechanics with the tier 3 skills from Radiant Dawn, as well as the low percentage hit rates from all the first 5 Fire Emblem games (due to the hit rates being the actual hit rates, as opposed to 6-13 in which the hit rates are false due to the 2 rolls average system).
The randomness is part of what makes the game interesting. With very few exceptions (the only ones I know of being Lunatic + in awakening, parts of Radiant Dawn Hard and parts of Thracia 776), you can always make a strategy that will work regardless of chance. But you can also run different strategies that are only possible because of the randomness.
I have to say that I'm also very confused by your claim that the characters from previous games look realistic. The only games in the series this is even remotely true for are the Tellius games, and even that is stretching "realistic" quite a bit.
Overall, your complaints are nearly all misinformed. You think that your complaint is that Awakening is different from all previous Fire Emblem games, but it's really a complaint that Awakening is different from the Tellius games. Most the differences have plenty of precedence in the Fire Emblem series.
