You lose a sizable chunk of stats, ie; haste, crit, resil. and in alot of cases, respect.
Some classes gain noteworthy abilitys, like 71 for 226 ilev Arche axes, 72 for Paladin wings, and the 10-15k hammers as ret, Spirit beasts/masters call as a hunter, etc.
This is what I'm wondering about. I noticed that at lvl 70 I didn't have much less hp than those 74s. Are those 4 levels, stat-wise, an actual downgrade, or? How much hp/resi/stat decrease could I expect?
Also, I'm leveling a paladin, so having lvl 72 for wings sure is a big incentive to go above 70. The fact I wouldn't be able to change teams wouldn't bother me too much, as I intend to play this with two RL friends.
The loss comes from the effectiveness of secondary stats. Let's say that between 70-74 your gear didn't change one bit. If you have 40% damage reduction from resilience @ 70, you will probably have about 30% from resilience @ 74. That's assuming the numerical amount of resilience you possess doesn't change. Other stats like crit and haste scale the same way. Basically, if you want to get the most out of your secondary stats, you would want to stay @ level 70. Some classes don't really care a lot about their secondary stats over their primary stats and stand to gain something from either baseline class abilities, gear, or talents by going above level 70.
The loss comes from the effectiveness of secondary stats. Let's say that between 70-74 your gear didn't change one bit. If you have 40% damage reduction from resilience @ 70, you will probably have about 30% from resilience @ 74. That's assuming the numerical amount of resilience you possess doesn't change. Other stats like crit and haste scale the same way. Basically, if you want to get the most out of your secondary stats, you would want to stay @ level 70. Some classes don't really care a lot about their secondary stats over their primary stats and stand to gain something from either baseline class abilities, gear, or talents by going above level 70.
It's already been pointed out some examples of what certain classes stand to gain.
This is spot on. Well said.
Secondary stats drop about 8% per level above 70, to reach a 33% loss at 74. Because the gear is so strong at 70, most classes do fine staying at 70. I took my resto shaman to 74 for the 25% boost to healing, as I play exclusively in battlegrounds. If I wanted to arena with a resto shaman, I would choose a 70 over a 74 for the extra survivability.
if you really want to be op i suggest going to 75 for an extra talent point!