It's all personal preference at the end of the day. The thing is, I'm really not much of a game lover anymore. It's sad, but I find very few games hold my interest. I never complete them, and I never play them for too long. I'm not sure about BF2142, but at the moment it's one of the few games that is working for me.
I agree with the point about BF2. I didn't play BF2 much, but it is very similar. So if you wanted a 100% fresh experience, you might be a bit disappointed. And no, the maps I've played on so far aren't huge like the massive dessert one on BF1942 (can't remember the name - the one with the flying fortress). But they are in the league of the big maps on BF1942 ... just not the huge ones. And these ones are more densely populated with lots of ruins etc.
I've said it already, but I will say it again. The best thing about this game is the Walkers. As far as I can tell, they're the most powerful unit, and as infantry you brick it when a walker is in the vicinity (unless you have a rocket launcher). You just keep your head down, spot them with the targetting and Q key to let other people know they're there, and just let them go by (if you're lucky). When you're in a Walker, you know you can cause a lot of mayhem. They move really well and realistically too.
The jeeps, like I said, are mentally fast. You put your foot down and they shift, and you can press sprint and the engine flips into turbo and literally nobody could track you with a gun. They have a good machine gun on top, and then space for two people to sit in the back and fire their own guns. There are also two types of tank - traditional tanks which have tracks and hover tanks which can strafe and are tricky on hills.
These have a zoom feature, which makes them the only really effective vehicle against walkers, as they act like sniper tanks. I found that out last night having died about 100 times trying to kill walkers with various guns.
I've not flown the ships much yet, but they seem to be fairly easy, with quick take off and landing, so easy to pick up squad mates. Can't comment too much on these though. Also there is an APC which has (I believe) 4 or 6 machine gun emplacements and pretty good armour, so it's a good way of moving people about.
So far I would recommend it, and I dont recommend many games, but as I said before, if you want something totally brand new from BF2, maybe it won't offer all that, although clearly the weapons and vehicles are now, and Titan mode. Gonna try that tonight. Oh yeah, for people that don't know, Titan mode has each team with a massive flying ship which can do independance day style ground attacks. Each team has to defend their own ship and destroy the enemies. You have to battle to get ground silos which then systematically launch missiles at the enemy mother ship. Once the shields are down on the enemy mother ship, you fly onto it, or fire from ejector pods on APCs and parachute onto it's surface, and then battle your way inside through the corridors, expose the core, then blow it up.