Before Fitbit, I was on DailyBurn and SparkPeople - both of which contained a better database. Currently, MyFitnessPal has the largest database and there is integration with Fitbit if you want to go that way. but I just prefer using Fitbit.com and the mobile app - it has a better UI and no ads.
Fitbit's business model does not require it to have a comprehensive database, but it is a nice addition so unfortunately I guess you will be manually inputting food a lot - which is fine if you are on a strict limited diet 365 days a year but when you choose to indulge and be adventurous then there is where the problem starts.
When you can't find what you are looking for, often times you don't log it, and if this happens quite often then you just don't bother with it. For example, when you are out and just had that nice ethnic dish, are you going to be prudently spending the next 15 minutes or so finding the calorific content on Google/MyFitnessPal? You would most likely say that you will deal with it when you return but when you return, how often do you do that?
I think the lack of a solid Food Database seriously hampers the mobile app's use case especially when you are using the Ultra which does not allow for syncing to Phone.
