S/R, S/Wd, and W/S are the only "god" tier DPS relative to burns which is pretty much all that matters now-a-days. W/M could be considered in that category simply because it is by far the highest sustained damage, therefore would strongly dominate the few long fights that can't be burned.
Ch/M being considered god tier is subjective I guess- if you make a party around it you'll be able to 1 shot most bosses but it's risky, especially after the nerf. I wouldn't consider such a one trick type class to be "god tier", especially because in a normal raid, it could be complete trash if you don't hit silence seal consistently. Also it would be very RNG based in a normal raid because if you don't crit, you'll get massively out damaged by most other classes, even not among the "god" tier.
Wd/Wr and R/M should definitely not be amongst the "god" tier category. They do well in long fights, which there are very few of, but they aren't even the best when it comes to sustained damage. When it comes to burns, they are ridiculously outclassed simply because they do not have a skill that takes advantage of AD as well as scouts or warrior/scouts. The boss will likely be dead from a party of scout's before the warrior/warden's damage would spike (this class is better suited for 10-20s burns rather than 4-5). Wd/Wr and R/M should be for certain moved down to the "top" category.
Scout/Warrior kind of sits in the middle of these two categories tbh. Simply because it's a scout, it has the potential to out dps all the classes in the top tier, although it's not really the best scout to play when compared to scout/rogue and scout/warden, therefore i think this is again another judgement call based on the person.
I don't think there should be any god tier for healers because most are viable in different situations. Druid is overall a better healer than priest, simply because it's easier to play due to MEF, although P/K can be a lot more viable in certain situations where suitability is an issue. I think the whole tiering system for healers should be changed to viable/not viable. Also, D/M provides literally nothing useful to your party, just because it's a druid doesn't make it more viable than priest/knight. P/K and D/M should definitely be switched simply because having a D/M is a pure waste of space in any raid. The same goes for D/S healing tbh, cams are overkill heals in most dungeons, and you're sacrificing having amp or AoW inside the dungeon for heals that aren't necessary. When it comes to healing it's really hard to classify it like this, hence why my suggestion to change the classification for this class. P/K, D/Wd, and D/W are generally the healers you would want in your party, the others are very situational and therefore less viable.
Do not reply to this saying "oh I'm a war/mage and I beat scout's in burns" because at the end of the day, it comes down to player ability. A good player will likely beat a trash player playing a better class. Also, certain classes become more viable depending on how you build your party, but overall, this game is strongly dominated by physical DPS. A group of the best scout's will forsure have a stronger burn than the group of the best mages for example. It's just how the game is designed right now. Runes of Magic is not friendly toward the mages ironically.
Also, just because some classes are really good, doesn't mean they're fun. Warrior/scout is boring as balls but it does an insane amount of damage. Warrior/Warden isn't as good, although you can still do good damage, provide a buff for your party, have a bunch of more utility for trash, and is much more fun to play. Just putting that out there incase any actual new players see this.