Would this be a good machine to do hemming of pants? Thats all I need it for. For hemming dress pants and jeans.

Yes, this would hem pants just fine. Remember you would not be able to go through a huge number of layers of denim so if you have very heavy denim and thick seams, there could be an issue. But not for dress pants or normal jeans. If you change needles to suit the fabric, you will have better results. For example, there are denim needles (heavier gauge to punch through the thick fabric) and ball-point needles to sew effectively through knits. If you can run a test of your hemming stitch through similar fabric first, you will get a good result by adjusting tension to get a decent stitch. If the pants are very good ones, use a fresh needle and very good quality thread. (I like Guterman or Mettler.)

reviews for singer 2277

This machine is compact, yet powerful. It delivers all the basic needs of a larger machine in a small, affordable Singer

does this machine have a reverse stitch

Yes, this machine does have a reverse stitch and it works well.

Does this come with an automatic bobbin threader?

Depends on what you consider automatic. This machine lets you put the bobbin on top and then you attach the thread to it and then you use the foot pedal to feed thread on to the bobbin. Then you put the bobbin in the machine for use.