Firstly, understand that people are more likely to review a game if they percieve it negatively than positively.
It is true that PA has some issues (naval balance, etc). It was also released too early, in my opinion, since offline was not included among other reasons. However, offline mode is now a part of the game in the latest beta build, and should be added to the main build within the next 24 hours.
Overall, this is a seriously fun game that breaks new ground in the RTS genre. On these spherical maps, you can be attacked from any direction. On the flip side though, you can use this to your advantage to pull off sneak attacks from an unexpected vector. Orbital play and the ability to move between planets adds yet more depth and complexity.
I have heard other people complain about the controls, but for the most part I find them adequate. You can assign control groups to make selecting specific armies easier, as in most good RTS games. The current hotkey support is limited, but you can download the "Hotbuild2" mod using PA Mod Manager to assign hotkeys to build specific structures and units. Camera anchor points let you jump to saved locations at the press of a key.
Graphical performance was great for me on my Lenovo Y410p laptop with the GeForce 750M, 8GB of ram, and Core i7-4700MQ 2.4GHz processor. I rarely had any graphical glitches. If you are having performance trouble, the first thing you need to do is update your graphics drivers and make sure PA is using discrete as opposed to integrated graphics if applicable.
The AI features four difficulty levels, and is a competent opponent to fight if you aren't comfortable with PvP play.
Now, on to nitpicks. The biggest issue I see right now is naval balance. Although it has improved markedly, naval pathing is still a bit buggy. Naval units in general are too slow, and don't provide enough bang for their buck. An expensive ship can quickly be demolished by a handful of tanks. Targetting of ground units is also poor. Orbital units ought to be a bit more varried, and I wish there was a multi-unit interplanetary carrier. Teleporters are a bit too easy to set up. I'd rather have to land a small army with a transport to secure a beachhead, and then set up a teleporter for reinforcements. Overall, I think there need to be more and more specialized units.
Aside from all that, this game is ♥♥♥♥ing amazing. You can ♥♥♥♥ing crash moons into planets, blow planets up with death star lazers, fill the skies with nukes, send nukes between planets...you have to play it to get it.
A quick note on offline play, just released in the latest beta build. I tried it and it was completely stable. Uber recommends you don't play offline without 4 cores and 8GB of ram, but I was totally fine, at least in a 3 player game, with 2 cores (phyical cores, I don't know if logical cores count).
Seriously, buy this game!