Character Motor Collision

Questions & Answers
1

Problem: Collision doesn't slide off objects well...too sticky

Reproduce:
New Scene...
GameObject: Create Other: Plane
GameObject: Create Other: Cube
Drag in First Person Controller Prefab From Standard Assets (herinafter 1st PC)

Reset all positions to 0,0,0
Scale up the Plane (5,1,5) and Cube (5,5,5) 
Move Cube up (Y=2.5) and 1st PC up (Y=1.05) to be proper level with the Plane
Move 1st PC Z=-20 and rotate Cube Y=30
Expand 1st PC and select Main Camera within that, set position Y=2 and Z=-5

Change 1st PC > Character Motor > Movement > Max Forward Speed = 30
Disable 1st PC Mouse Look Script (not relevant to the problem)

Run in game view and hold arrow-up to race the capsule into the angled side of the cube

Observe that movement speed is reduced to a crawl as capsule -slowly- slides along the face of the Cube...speed was fast before and resumes to fast after it clears the Cube.

2

Is this because they have default physics materials on them? If you want something to slide then you need to create a physicMaterial with friction set to 0 or something very low. and also set frictionCombine to Min instead of average as it is be default.