The current state of RO2 makes me play and appreciate RO1/DH all the more. It's terrible and a big step backwards toward Call of Duty. The only nice new thing is first person cover system.
RO1 became much better over time, following new maps and mods. RO2 also will get better in the same regard. Tripwire says that they will be adding a ton of stuff that didn't make it into the release. RO2 has only a fraction of guns and vehicles that RO1 has.
Most of the maps are small, close quarters. When you aim down the sights, you get a very large zoom. Combine this with a rifle in tight quarters and you get punishing tunnel vision. Did I mention you get an extra zoom by pressing Shift anytime? Haha! Your MP40 can snap off headshots all day.
You cannot enter/exit tanks, but only respawn inside one. Pretty huge ramifications.
MGs are straight out of vanilla BF2 with all the deviation and recoil. To actually hit anything, you can single fire the MG34. So you aren't firing an MG so much as a large capacity rifle. If you enjoyed using MGs in RO1, your dreams are crushed! It seems the only way I score kills with MGs in RO2 is by using its penetration to blindfire through obstacles. Since most guns have 8X ACOG, you will get sniped if you try to use a MG like a MG. You know, area denial, suppression, if not raw killing power. The kill cam will guarantee if you setup somewhere and actually kill someone, they will just come back and snipe you.