Signus is right. It depends what type of tracks you put together. Its a blend of tracks which is the key. To go from one track to another completely different track can be very good.... but it can also be appalling bad. Usually a good link track or sometimes two tracks would blend it better.
If I'm drawing a pencil portrait say... I wont go for a very hard shading to almost nothing because it will just look like a line division between black and white and it would look startlingly bad. However, even a blend of a few millimetres which links the two tones (say if it is a sheen on the persons face) it can make the piece look amazing.
I'm playing a set in Newcastle tonight, and I'm going to be playing allsorts (although mainly of the hard variety... but different tempos and vibes) It'll vary from say a slow Scorn track to say some of mine, Sully's or Reso's breakier tracks, then back to some slower stuff. It just totally depends how the feel for it is. I may not put two tracks back-to-back even if I had the proverbial barge pole, however with the right tune in between, it could be brilliant.
And for the thread.... it's all about trying new sounds in my opinion. The last record Bloodied Blade Record was double kick drums, metal guitars, and grunts from a mate who does the vocals in Coprophagy (grind core death metal band) as well as a dubby breaky track, but the next record (which is out in a few weeks!!

)has hip hop, dubby and heavy elements, all with a similar step and bassy feel.
It's good for variation is experimentation
