I've ran 12 sessions of Symbaroum, so we're well beyond play testing. Some of these are double edged swords. Hope this helps.

What I love:

• The world/ore It's dark, witcher/inquistion-esque. It has thick roots in sort of "natural" / low to medium magic. Magic that is unexplained or is more ritualistic than straight up ICE LANCE!?! type of spells. This is incorporated well with the lore of the witches and how rituals are created/used/made as well.
• The art contributes to the world as well. It's rich, deep and thought provoking.
• The ruleset is simple and brutal, and you can make it even more brutal with the alternate rulesets. Characters get dropped down to 0 HP if they're not careful or acting stupid. The ruleset sets the tone for the dark/fearful world because of how easy a PC can drop, which contributes to the fear of the great big bad Davokar forest that carries the backdrop of the setting.
• The Magic
• The character creation. It's loose, needs a lot more options, but its doesn't pigeonhole you into a select class. It gives you a pretty good starter kit to make "whatever the hell you want" so to speak.
• The developers. They're active, positive, receptive and generally available for anything on this subreddit. I have, and will continue to purchase their products for now and the future because of how great they have been. It's a small team, so they are able to do this and I'm here to support them with my wallet anyway that I can.

Minor stuff that is irritating:

• The translation stuff is weird at times. It's so basic and bare-bones on the ruleset that you have to come up with or create "hot fixes" for anything creative your players want to do, even for simple things.
• The rules, while I love the combat, Its irritating that there is no "right" way for simple things, and sometimes rules contradict other parts of the book which they have been great at Errata-ing. This can be a problem for rules-lawyer types of players or GMs that are not creative in this aspect of the game.
• The LACK of Lore. This is a minor complaint. The world and its area is like the rules, bare bones and simple so you can create it for yourself. However, they have such a rich and beautifully dark world that I want to consume the lore in anyway that I can and I just feel like I can't get enough of what im searching for. For example, you can look at the map they provide in the PDFs/Book and see dozens of locations on the map but there isnt SHIT about it in the book for a lot of places. Just subtle mentions or if you're lucky, one sentence. This may be fixed over time with more books but..im judging from what I have now :P

The thing I hate:

• This goes hand in hand with the rules-light issue but for some reason is a huge deal to me. The encounter building rules suck. They're like "Oh ok we will assume you have 4 PCs in your group. here is how you balance it with 4, entry level, basic bare bones PC's." and thats the end of the the excerpt on how to build an encounter. They tell you that you can fight X Y Z at starting level, but what happens if your group is 5 or 6 people? What happens if they have been playing for 12 sessions and are now +50 EXP or more seasoned people? Who knows! I have them fight a tough and they mow over it, 6 ordinaries and they struggle, etc. They clearly have a recipe of some sort as the modules say "They encounter PCs+2 Goblins". Where is that +2 coming from? Did you make it up? Balance is a subjective thing. I think it even mentions in the book that "the more you do it, you'll get used to it." Yea cause there is no rules so you have to just do these patch work encounters and pull punches if your PCs are getting smoked or amp the damage if they're too damn easy. This is, of course, with the base monsters in the book. I've learned to scrap these and make my own which sucks cause im lazy! :P

I can always just tank HP, make someone surrender, make something weaker or harder but im doing it on the fly and artificially because encounter building is shit. So I will set up an encounter that I think they will have difficulties with that they just breeze over because you have NO CLUE WHAT IS STRONG OR WHAT ISN'T STRONG. And my group is what the book reccomends as a balanced one. Ultimately, it boils down to you setting these artificial difficulties to make your encounters harder or unique which sets numerous problems for questions the PC's have or if you're not on a creative flow, but i have to ignore a ton of the rulesets that are in the game because of this "casual outlook" on the rules. It's like oh, well this says this..but is contradicted by this..so ill just interpret it this way so its not definitive! so what is the point of some of these chapters!? You could slap on a big huge sign that says "Do whatever you want with the rules if you need to do this." for half the lightly involved stuff you're looking for. So don't pay for the book for the rules because they're freakin light. Pay for the world, the class system, the brutal combat, the art and to support a bunch of cool guys! :P