Lack of letter of recommendation due to long-term research experience I only have 2 research experiences, one of which lasted more than a year and is starting to look very promising for high impact factor publication (I'll be the second author though, and it's not likely to be published by the time of application). The other is with an highly esteemed professor from the U.S. who's quite happy with my 2-month research internship in his lab. Both are willing to put in some good words for me, but that's all I got, so I need a "did well in class" letter of recommendation which will probably be worth nothing. Will this hurt a lot to my graduate application? (I'm an international student)
If you have two strong letters of recommendation for research work, that's already quite good.  I would think that "this person is a strong student" letter filling out the set will be just fine---after all, somebody has to testify that you're good outside of the lab as well!