Cute in a very saccharine way; insta-love followed by many declarations of love and no real conflicts but lots of flip-flopping from trying to make conflicts seem real. I'm a very squeamish and sensitive reader, so I never think I want tension, but then I read a book like this, and I realize: no, it's necessary.
Some interesting ideas here--Tyler is torn between pro baseball and pre-med, Emily is not a rebel but she wears that identity in the hopes it'll save her parents' marriage--but none of them are really developed fully and the author doesn't take enough risks for there to be any real payoff in the story. Mostly just lots of talk of Emily and Tyler falling in love and not really enough to make me believe it. But it does read quickly and if all you want is something sweet and quick, I guess this sort of works.
Also, lots of blatant dangling modifiers.
This seems to be trying to hit somewhere between YA and NA, which I'm actually all for, especially since NA tends to just be lots of sex scenes. Emily is eighteen; Tyler is twenty, and has presumably finished his second year of college (I don't think it ever specified exactly, but that's what it seemed like).
As for content--language but no f-bombs, it goes up to and including the s word. Teenage drinking without consequences. Mention of "jailbait" several times before this is debunked. Lots of kissing and even being in a pool or in a shower together (but fully clothed in the latter case), and lots of talk of being in a bikini or taking each other's shirts off, and some allusions to erections, but not explicitly named. Actual romance doesn't go beyond making out.