Undergraduate thesis quality in research field I'm a graduated student who is trying to continue his education with a Master or possibly a PhD. Surfing the net, I noticed that to enroll for some PhDs an example of writing is required. I successfully completed my bachelor degree (as required) with a thesis about a proposed topic. I wrote it entirely in English, which is pretty uncommon for many colleagues from my country, but my work didn't show promising results. Long story short, my algorithms aren't really good. 

Is that something common or it's a sign of demerit? Doing research for an undergraduate thesis and ending with bad results, is this something that you should avoid speaking about when asked about previous research experiences?
In undergrad research, how you did it is more important that where you got. 

If you did your research properly, that is: adequate bibliographical revision, adequate problem definition, reasonable approach and a proper interpretation of the results, that is an excellent thesis, IMHO. Even if your conclusion is "these methods are terrible for this", which, if true, is a valid contribution.