It has the potential to be a good game, but it needed a lot work to get there. The maps are by far the key problem. Things that, in my opinion, would improve the game tremendously:

• Voip on by default, but still PTT
• Make health buffs scale as a percentage, rather than a flat value. That a fully buffed light has almost identical health to a fully buffed medium or heavy really makes the light the toughest bodytype to kill by far.
• complete weapon overhaul. There are maybe two SMGs worth using and the heavy weapons to not pack a sufficient punch to make up for the massive hitbox difference. ARs aren't bad, each is unique with some pros and cons.
• Combat intuition needs to be overhauled. Completely. A sound and visual cue when any enemy is looking at you? It completely ruins disguises and makes the Operative worthless. If everyone on your team has it, CommHacks actually make things harder for your team, not easier. My favorite would be to give the Operative the ability to buff the team with only the sound component of the perk and scrap it from the general list. Something else can be added to replace if necessary.
• New maps altogether. They don't offer anywhere near enough routes or reasons to fight over places that aren't the objective. The light body type doesn't get enough play with the SMART system, because at most it provides a single extra route that everyone just watches anyway. Maps need more verticality, more bypasses around chokes for various bodytypes (and ideally requiring all bodytypes to do their roles, like heavies pushing through the choke while lights hit the defenders from unexpected angles).
• Maps favor holing up around the objective rather than defending other places. There should be far more secondary objectives that progressively make it harder for the defenders if they are taken by the offense, a la TF2's Steel. Capping the last point on Steel is almost impossible if you haven't taken any other points, but once you get all of them, the defense has serious problems holding off a push. There are a few maps that open up a few sideroutes, but they don't do that much.
• give the ability to change body types in a match. It is immensely frustrating gambling that everyone will have a mix of bodies when you load up a random server. If I spawn on a team with all lights, I'd really like to be able to switch to something that isn't a crackmonkey with a bullethose. We can change classes for just that reason, extend that to body types.
• A full minute of hacking and 10 seconds to remove it seems unfair. I've only seen hack objectives passed when one team is absolutely rolling over the other. At the moment, an adrenalined engineer can remove almost all progress from a hack objective while under fire and there is absolutely nothing the attackers can do. My fix would be to have both teams able to hack the box at identical rates and remove engineers' ability to defuse the hackbox. That is, if the attackers Ops get the hack to 50% in 30 seconds, the defenders could hack it back to 0 in 30 seconds. Both teams could hack it simultaneously.

The game is good, the maps aren't (which is a shame, they look gorgeous). Get TF2's mapping team and the game would be a solidly good. Rebalance some weapons and change a few things, and the game would be great. [*]