Rhythm: For every good guitar jam track online, there are tons of mediocre ones. One of the biggest reasons for this is that many of them lack an interesting rhythmic component. They consist of a simple power chord progression that really doesn't give you much to build your phrases/solos off of. Also, many of these jam tracks have the same rhythm the whole track. They don't even give you an opportunity to change your phrasing by presenting you with several rhythmic variations. When deciding how valuable a guitar jam track is, rhythmic complexity should be an important factor.
A unique melody is a crucial component of any jam track. Obviously, the point of guitar jam tracks is that they are devoid of a lead guitar track or at least have plenty of space over top of the guitar track(s) that is there for the player to construct their solos/musical phrases over. With this being said, having some sort of melody in the track is important. It allows the player to hear how what they are playing interacts with the nuances of the melody(s) of the track. Their improvisation can then consist of responses to this melody and not just phrases with no melodic context. The end result being a much more complex and interesting jam.
Length is a much bigger factor in determining the value of a guitar jam track then many people give it credit for. There is nothing more annoying then being in the middle of your best jam ever and having to stop because the track has ended. Yes, you can loop the track, but those that have been in this situation will understand what I mean when I say that it's not the same. An ideal length is between 3-5 minutes. That way it's not to short, but also not long enough that by the end you're relieved that it's over.
The way to get out of the rut you may be in with your playing is to get out of your comfort zone. Look for jam tracks that are something different then you are used to. If you constantly put yourself in different musical settings where you are forced to expand your horizons, you will improve as a player. Even if you aren't in a rut, there is never a bad thing with trying something different. If you find a jam track that's interesting you should try it. Who knows, it may be one you keep coming back to and something you can give credit to when you develop your own style.
Sound Quality: The quality of the sound on the recording is a big factor in determining the value of a jam track. The reason being if you can't hear the nuances and subtleties of the playing, it means that the jam track is not particularly good. Obviously, you aren't going to be able to hear subtle details if there are none, but that in itself makes for not a very good track. You want the jam track to be as clear as possible. Both in its composition and its tone/the tones of the recordings. This will help ensure that you get the most out of it.
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