These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
During her date with Dan, Savannah asks, "Do you think Marti's sexy? I do." Case closed.
Also, according to the Wikipedia page at least, one of the cheerleaders is a lesbian.
This, where Marty ditches a law rally at Nashville to help the Hellcats in a flag football game:
Marti: (to Savannah) I chose you over them.
How about Alice teasing Jake about how she's gonna go back to her dorm filled with beautiful cheerleaders and have a negligee tickle fight when he refuses to put out. And then later she slaps Savannah's butt, clearly enjoying her scandalized reaction
Everyone has chemistry with everyone else, no exceptions. What you think is an exception is really just that the characters in question haven't had enough screen time together.
The pillow fight between Marti and Savannah which ends in their making out up.
Alice and her reporter friend are even more blatent.
Mary Sue: Marti, primarily of the sympathetic type but her attitude towards cheerleaders/cheerleading in the early episodes (and some of the later ones) shows a healthy dose of Jerk Sue. Marti was never shown to be bad at anything with the possible exception of maintaining a relationship, and was introduced as the thing the Hellcats needed to win, which generally comes off as Informed Ability since she seems no better than other members of the team and didn't even do her audition properly "freestyling" instead because she got lost.
The Woobie: Savannah, as of episode 2. And as the season's progressed — wow, so much!!