EDIT - like it says, it's my FIRST impression and it's not very good, but I'm still evaluating IF and I do see some potential. Just in case you are reading this and still considering IF, then take what I say here with a pinch of salt.
Having a great day and don't want to ruin your good mood? Then look away. Unfortunately I don't have much positive feedback on IF. I just learned about it so I can't really say I had high hopes for IF. However I paid for it so I feel obliged to say something. Being a veteran BIS fan I'm used to bugs and problems that needs to be ironed out over time. BIS however always delivers good design and the bugs are often engine related and not because of sloppiness. Clearly AWAR have skipped a lot of tweaking and bug testing. I found bugs after a few minutes. For example if you get hit while in a tank, the sound completely disappears ? It doesn't come back even if you switch units or respawn. This bug alone renders tank battles obsolete, or at least for me. Perhaps it works for some. Then we have the classic AI path finding problems (again) and vehicles tend to get stuck in buildings and objects. The editor is working just fine, but there are no templates for quickly setting up MP missions, for example WF, CTI or even CTF, TDM. You have to do everything the hard way, including scripting. In most coop missions done by AWAR you respawn as a bird in MP Seriously? Finally what's up with the Blitzkrieg mode? It's the worst yet! AI is severely broken on medium and large sized maps and simply mass group on the first capture point even after it's been captured. The rest of the capture points are left undefended and uncontested.
That's about it. There is nothing else to test except the campaign and I already lost interest. It's clear that AWAR was hoping that the community would fix their game. A challenge some of you may enjoy (however unlikely with A3 around the corner) but good luck with that. In this state IF should have been released as a MOD and not a fully-fledged game.