This game is so good, I personally highly recommend it, while like any game they have some flaws, the dev team is actively listening to the playerbase and making much needed updates and changes to the game as needed. It has been a long minute since I've found a team of devs willing to listen to the concerns around their game as much as this one.

In terms of gameplay, each mission is relatively unique with some fundamentals remaining the same. You will quickly realize that there are only a handful of styles of missions but, the different areas of the map combined with the varying objectives can make for some fun challenges. I'd say its a fair price.

A lot of the negative reviews complain about problems that were fixed / are being fixed in the updates they are making now. Such as respecing and more talent points. As for the whole end-game grind usually I find that T3 is plenty strong to work in and the in game Workshop offers many solutions to all the issues I've read. Simply play some missions till you afford the picks in the Workshop and you have a reuseable tool to bring with you every time.