I must admit to knowing little of Steam however I would agree that Reloaded is far from what one would call a Beta, more an early WIP/alpha a few if any features are what I personally would look at as being anywhere near complete and all things partially developed only whilst other things are added in the same vein. I would not know if any of the features will ever be further developed and to what extent as that's not a reality until it happens. Major features of terrain, water and AI just to pick the obvious out.
What some might call more advanced features which should appear in any modern game engine such as environmental effects, particles, particle weapons and so on are not even in the pipeline as far as I am aware. Then there's probably tens or hundreds of other things missing from a complete all round game maker engine. By and large one may say its easy to use but its not that so - without many skills and additional resources an end user may need to actually do more than the basic out of the box stuff with without relying on them having such resources and skills or more importantly relying on others or TGC to provide such support. This is compounded currently by so much inflexibity with so much hard coded stuff and no indication that an end user particularly without a high degree of knowledge, expertise or skills would or will ever be able to gain more of much needed flexibility.....
At the end of the day if things are hard coded and limited/restricted by that theirs not much an end user can do about it. One can only call to use internal stuff or extend if the engine internally will allow that.....
One can only call upon functions and so on that the engine supports internally and provided for therein and the engine is closed which in and of itself is not a bad thing but limitations and restrictions are if the engine don't provide for much user flexibility.....
Simple examples might be : I don't want enemies corpses removed on death thank you. I don't want to have need to stop and press a key to pick up a weapon or any other collectible item or necessarily open a door. I want to be able to give any weapon of choice to any enemy type and not restricted to a pistol and don't want these things and more to be hard coded and fixed removing the creative game making choice. I don't want all characters in the game to necessarily have all animations in the animation set if the character does not have need for them and so ideally there should be a choice to drop animations and or load them as necessary for the character at run time and so on....Some of these things may be ready possible that I am unaware of or maybe added during later development, or they may not. At the moment many things included in what we have to date are hard coded that don't need to be from an end user game maker perspective, notwithstanding what is yet to come and may be added.
Beta Reloaded maybe and it could be Beta for many years to come yet depending upon what you call Beta and what you call not Beta....
All seems to be under development and partially developed throughout and none either complete or anywhere near like being so and none of sufficient game making quality where improvement could potentially/possibly be made to best advantage for end user benefit in making better games.
Easy to use is only partially true and its perhaps more complicated than many might wish or might be necessary in some areas perhaps........a matter of opinion.... You can still make a game with it of course and some effort is to be expected and more so the better the facilities and feature set it might offer. The more it does the more work you will have to do true to say.
On topic specifically perhaps there are numerous areas where the Terrain feature could or could have been better implemented or improved. In some ways at the moment it is not as good as it was and in other ways is improved e.g. additional terrain tools.
As said I know little of Steam, know something of MP and know little of how to make a game engine from an engine development point of view, rather just as many others know just a little about using indie engines as a game maker and making a game and even then of a sort. I am no expert.
TGC I guess is doing what they need do during Reloaded development life cycle. Yes its a Beta so again as is always the case we will need to wait and wait longer and see what it eventually becomes.
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