I have to say every guy Lorelai has ever dated has something special about him .
But
Luke although I admit he was kinda cool for sometime , i didn't like the way he treated Lorelai . First he didn't tell her about April even though he had no proplem telling his sister . He always complain about everything, he doesn't believe in " Valentine's day " for God sake and he canselled their wedding.

all these things i might forgive but the way he left Lorelai walk away in the end of season 6 was just too much .
Honestly I think he can make her happy for awhile but not for long.I don't think she was in love with him . She was in love with being in love . She saw this Guy who waited to be with her for 8 long years .. one who she knows will be there for her and for Rory . Even she said in the "therapy session" in the season 6 finale that " when i knew how much he cared for Rory that was it , I knew i was ready " .
" He cares about Rory " , If you ask me this isn't the most romantic thing you'd say about someone you're madly in love with.
About
Chris , I don't think he's good enough for Lorelai because she can't count on him . He's never there when she needs him. But i think he's the one she loves . She always wants him around . When he was With Sherry she really was upset.. even in the end of season 6 when Emily was talking to her about how lonely he was and how Emily wanted to set him up with someone , Lorelai really Got Upset .. She almost got into a car accident . and she trusted him . She even said to him " I know you will always have my back " . He was the one she broke up with Max for . Anyhow I believe with no doubt she loves him.and he really understands her.
I think the one who really deserves Lorelai is
Max . He was perfect for her . I loved how he talked about Faith, Love and Poetry as a whole . He sent her 1000 flowers . He was Funny too . That poor guy really loved her .
I love when Lor said to him that she wanted him to Know her bad qualities as well as the good ones . Then he said : " How thoughtfull of you . . It is you know 'cause i might think this woman is absolutely perfect " .
it was something like that

I really was happy when he came back . . that was a cool episode ^^
I agree with " bingbong " about the statement lor made about how she didn't love him . She did love him . When they broke up she was in a bad shape and she was the one who came to his house and told him that she missed him .Not to mention how She listened to that first message he left in the phone like ten times.I think if she knew that Chris was with Sherry at that time she'd marry Max without thinking so much about it .