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Hey MakersMike,
Welcome to World of Warships and USN BBs. I would recommend not stopping the line but taking a pause and make sure you have a grasp of the mechanics before advancing into the higher tiers. Tier VI and Tier VII are where you can get comfortable with the game and not get overwhelmed.
The New Mexico has been around for a long time, so there are a lot of players that have played it. Taking this into account and how many battles are on the New Mexico, it would be almost impossible for 1 player to make a dent in the overall stats of the ship =). What have you seen as negatives about the New Mexico? Slow? Shotgun style dispersion?
Let us take a look at the New Mexico real quick:
Slow, this means you have to pick your course carefully or risk being out of the game for the majority.
12 guns with a "shotgun" style, this means you will not be the most accurate but you will have a lot of shells to fire.
Small and compact hull which allows you to maneuver well and dodge torpedoes.
Decent AA for its tier.
Average range but you can put the range mod on (I believe) which gives you a more respectable range overall.
When it comes to the USN line in general: I feel all of the ships that follow the New Mexico are good in their own way and you should not stop just because you have looked at some stats =).
In regards to other lines, I suggest taking a look at the wiki and seeing what other nations/lines interest you and decide from there.
Remember it takes a lot of games to learn this game and the biggest piece of advice I can give you: Always continue to learn, from both victories and defeats!