The ramen database is certainly a good resource and something I look at myself. I'm not sure about comprehensive English rankings but a ranking system should come to JapanTravel.com in the future.
The current number 1 on the site (and consistently in the top 3), Tomita Ramen, is definitely worth visiting and I have an article coming in the next week or so – really great tsukemen! http://www.tomita-cocoro.jp/category/2/
Sherilyn, Tabelog does rankings like that (tabelog.com). They have the Top 100 ramen restaurants around Japan as well as other types of cuisine, like sushi. I know they were making an English tabelog site but I could only see the rankings in Japanese.
Hi Sherylin, unfortunately, the website your friend presumably mentioned is only in Japanese http://ramendb.supleks.jp
But if you really want to use it, here you can find a very good instruction for English speakers http://www.ramentokyo.com/2009/05/supleks-ramen-database.html?m=1
You will be a little bit hard-pressed to find it in English, but I might recommend two options. One is the Ramen Map app, which offers a map of wherever you are in Japan that shows colored symbols representing the rank of various shops. Click on the symbol and you can see the name of the shop (all in Japanese) and it's ranking. You may have to go to the Ramen Database (Yes, there is one.) to see photos, but this will get you off to a good start.
Another good place to reference is Ramen Adventures, a blog and website written by Keizo Shimano, the father of the Ramen Burger. He's a good writer and an expert in all things noodle.
Ramen, just like anything else, comes down to taste. You have to eat a few bowls to figure out what you like and that may not always match the ranking. For example, tonkatsu (thick, heavy pork bone based broth) is very popular, but I often find it rather, well, gross. But again, there are exceptions even to that for me, i.e. Bassanova's Green Curry Ramen is so amazing it's hard to believe it's legal. There are also some good vegetarain ramen options, too, such as Loving Hut and T's Tantan.