Let's get this out of the way: Yes, there are some things missing from the game on release, but the core game is entertaining and changes just enough of classic RTS to make it refreshing.
The hero system is helpful in a pinch, the 1st/2nd wave mechanic is a fun new spin, the pre-game lobby adds some strategy before the game even starts, and the mechs are still mechs.
Some polish is needed, but the overall experience is fun and I will continue to come back to play more.
If I can offer some advise for this and every game - Don't overplay in the first weeks and months. Just enjoy what's there and be casual about it.