Yes... .very common at the start of a relationship... .any relationship.
Whether or not it is a

you would have to put it in perspective.
It's one thing to say to a new person that they are great... .best thing ever... .lovey dovey. That's all fine and good... authentic feelings.
It's another thing to say "you complete me... I'm nothing without you... .you have saved me from destruction... .my life was completely empty and now it is completely full... . etc etc.
Even if you hear the second stuff... .slow things down... .let them know you appreciate the words and are interested in listening more. What does that mean for them... .focus on listening and understanding their feelings.
Again... .one or two statements of the second category are probably fine... .especially if they have context they can give you. But it if seems like "all" they want to say to you is the second stuff... .then I would raise a
Also... .if they are ok with you saying back to them that you value and like them... .but you don't reciprocate with "your the best ever... .never had anyone like you... .etc etc"... .then that's a good sign. If they "demand" that you match their words... .that's not emotionally healthy.
Everyone gets to have their own feelings... and gets to have those feelings listened to, respected and valued.
FF