AbdulAlhazred
Legend
I actually think a lot of the confusion and delay might be removed if all effects were just (save ends) at least then they would be easier to track.
Instead of creatures marking they could inflict a flat -1 or -2 penalty to attack rolls (save ends).
Player marks would probably have to stay the same, but at least they are easier to track (player, not DM based).
From a monster point of view it is the PCs "until the end of their next turn" powers that are the most troubling (especially with creatures that act more than once in a round) so changing them to save ends would be good, or at least predictable.
As for the niggling -1 and -2's the problem with those is that many of them seem to come from at will powers, but I don't think I would have a problem with them all becomming (save ends). Though it might cause problems with the creature being hit with the same power twice and the effect stacking when really it shouldn't.
Eh, the problem I have with save ends is it really can nerf a character for the whole encounter. I can recall this happening a number of times. One time the wizard was bitten by a phase spider on round 1. That was it for the wizard, never did save until 4 rounds later and the player sat twiddling her thumbs for half an hour. Another time the cleric got knocked prone and dazed (save ends) by a custom monster. Same thing, the character spent the next 4 rounds sustaining Spiritual Weapon (so couldn't afford to stand up) and couldn't seem to save. It was an interesting encounter but it did start to get frustrating for that player, especially when the rogue died because she couldn't get up and move back into the fight to issue a healing word. Just last week the dwarf got weakened by a hit from an Orc Gruumsh Sworn and again it was an encounter long nerf that pretty well took the character effectively out of the fight.
I don't think its excessive to have some save ends effects and the above examples were all interesting encounters where the condition created tactical complications that were fun, but I'm not convinced I'd like to see tons of it. Maybe at high levels where bonus saves are easy to come by it stops being an issue, but if you have a bunch of monsters that all issue a save ends effect things can get ugly fast.