Just look at the fan favorites and how shallow their traits are, basically any character who kicks ass, blows things up and kills zombies will be a fan favorite. Darryl, Michonne, Carol, or most recently, the new Rick.
None of those characters are fan favourites just because they shoot guns and knife zombies and shit.
How is Rick only recently a favourite? Other than maybe S2, when every character was shite, I can't think of a time people didn't love Rick. As the leader, he drives the show's moral compass and its entire plot and tone.
Daryl is interesting because besides/despite being a badass, he can't lead and tends towards being a malleable henchman, a weakness which I think he is slowly overcoming (see his storylines with Merle in S3 and the dudes from late in S4).
Carol is interesting because she has gradually and believably turned from one of the faceless dead weights of the crew and a battered wife into a resourceful, independent warrior / mother figure combination who possesses her own unique moral sense.
Michonne is about the opposite of a fan favourite. Her character's been (for the most part, justifiably) criticised since she was introduced. They finally added some depth to her at the end of the last season, but I still don't care for her that much.
Not to mention that last season, Hershel was a huge fan favourite, and he was almost completely helpless in combat.
Even if people do tend to prefer the stronger characters, how is that in any way surprising, let alone shallow and baseless, when the show is about a fucking zombie apocalypse? Should the writers get rid of all the strong characters and develop a band of spineless leaderless clueless no hopes? Then the show'll be much more plausible and enjoyable.
And I agree that there are a ton of characters, but does every single character in a show have to play a huge part in every single episode? I couldn't care less if I don't see much of someone for several weeks, as long as, when the story swings to focus on them, their narrative is handled well.
To your point Zantera.....as much as I like the show I can't stand how badly they jacked up Tyrese's character.....compared to the character he was in the graphic novel. He was a bad a$$ in the comic and for as much as they try to make it appear like he's some restrained beast in the show....it's pretty annoying and they've just made him into a really strong sissy. They butchered Andrea's character as well....big time. She's awesome in the comics.
I really like what they've done with Tyreese. From what I've read, he is Rick's right hand man in the comics. He already has that in Daryl on the show, and the writers probably figured it'd be pointless to develop a duplicate of the character and have two running around. So they created a new character with an interesting flaw, someone who can decimate walkers, but can't bring himself to kill the living. I'd rather see him becoming a hammer-wielding yet sensitive caretaker type than, you know, a purposeless, depthless strongman character who is just cluttering shit up, which is probably what he would have been otherwise.
Apparently, they realised they fucked Andrea up, which was why they culled her and, from the foundation they already had, built up Carol instead.