What are people's thoughts on random events from Non PCs (monsters)?

Let me explain my thinking. I am sure you guys/gals can help flush this idea out.

Other games have tried something similar but I found them too routine and planned. To keep things changing and keeping players off their toes:

(all random):

1) Ambush: At random times certain locations along random spots along random roads a group of creatures (or bandits) are spawned.

Intended affect: Makes road travel less predictable and more alive. Players have no idea when and where this could happen. Might yield additional gold drops

2) Adventuring party: Randomly a moving group of creatures outside the norm of the area are adventuring, fight would be tougher then the normal area but would yield a higher magic drop

3) Raiding party: Town/farm/mine is attacked by a group of raiders/bandits where/when who knows?

4) Thief in village/town: A bad guy or group thereof run past or is in hiding

5) For PvP: Keep is attacked by NPC monster group, giants or what not decide it's time to tear the walls down and besiege a keep

The point being these would be seemingly random where and when. Some players may never see them

Age of Wushu has something along these lines. You will get NPCs driving coaches between two points and its up to the players to either escort them or raid them. Makes for some interesting pvp and also the players who raid the coaches get bounties and may end up in jail awaiting for a jail break from their guild.

These kind of events would work well in Cyrodiil where pvp is allowed though as one side could try and escort a special npc or equipment to a certain village or town. While the enemy tries to stop them. Could be done at a certain time or a random time it could even be done when a certain amount of hidden goals are met.

thumbs up for everything new and innovative.

I would be good with those.

I was thinking even more random then that. Say you have gone to area X 5 times, by now you know the area, monster moving routes etc.

But wait, what is this, you are walking down a path and suddenly 5 orc brigands jump out. This has never happened before, heck only a couple of people have reported this here.

or

You are in town on a normal trip and next thing you know a group of raiders strike the town out of nowhere

These can be done, it would likely not be entirely random, it would likely be based on a table with locations though this table could be huge and changed at dev whim.