After having spent enough time on it (>1000 hours) I can say I have mixed feeling with this game.

* The idea of mixing RTS map and your own units with a battle in the FPS, it's GREAT. Nothing I have seen before and the main strength of the game.
* The weapon system and its improvements it's addictive so you keep playing to unlock and improve some weapons/vehicles.
* Did I say how great is mixing a RTS with FPS?

The main problem I'd say is EXECUTION. Things in this game don't work as they should. I will explain this:
* The RTS game is terrible, the interface, the performance, the graphics... everything is awful and slow, you cannot group your units, you cannot sort or search them, the only way is micromanaging. It doesn't matter what computer you have, this will be laggy and slow. It looks like it was designed by students 10+ years ago.
* The game balance makes no sense at all. The game is not realistic at all neither properly balanced. So you find germans have the best weapons and then RETO suddenly decides to improve their weapons with no explanation at all. There are many examples regarding to this.
* The lack of maps. Although there are several big maps, after some days you will notice you are all the time playing the very same maps, trough different lines but 80% of War game will be in Town or Mountain Town. 2 Maps.
* The engine/performance. The graphics look old, they cannot afford any comparison with any 5 years old game but even though the performance is laggy and bad. I play it with GTX 1070 and even sometimes the game is not smooth. I'd say that developing your own engine with small resources is a huge mistake.
* The stability is terrible. I have never seen a game that needs to be restarted so many times. Every couple of hours you will have CTD no matter what
* The development policy is also total madness. A perfect example: there are 4 big maps although 80% of battles are played in only 2. You would think the first priority is creating new maps right? No way, RETO will release new sounds, new planes, nonsense weapons modifications (most of the time with no notice, aka ninja update) and many other "useless" things instead of MAPS.
* Tanks are a joke in this game. I really don't know how to fix it but a Tiger II shouldn't be scared of every infantry soldier they see on a motorbike.

With all these defects, issues and missmanagement. Heroes and Generals it's an exceptional game, don't get me wrong. The idea, the core idea of playing an FPS with your own troops and follow the progress in the RTS is outstanding. The problem is that is the only strong point of the game, the implementation of it it's really poor. I would love to see this game managed by a more professional/bigger company (I don't want to say Reto is not professional but they are clearly short on resources so the game gets old, unstable, poor on performance, unbalanced... and their priorities makes no sense from my point of view) I have to add that late changes done by RETO are following a better direction and they finally implemented some really needed features like giving orders to several AT's at the same time.

This game will die soon (I don't want it but I think it will happen, I still have 1 year veteran) . People have a limited amount of patience and while RETO mostly provide players with promises and poor results, other games appear and they don't do the same mistakes.
I really hope this idea of FPS/RTS will be properly implemented by a big company. They will make tons of money.