Seems like Freelancer meets Space Rangers but it's still way too early to tell.
I haven't played the second one, but it's supposed to be a More Of The Same sequel, so no. Not very much like either of those games. If you know the Star Wolves games, it's somewhat similar to those, though mostly in terms of presentation. SG is a mission-based strategy RPG in Spaaace! Where you control a single ship and upgrade your lasers instead of, say, play a wizard & upgrade fireballs. It's sandbox'y in the same sense that a TES game is: you advance the plot by doing certain missions, but you're mostly free to roam and do a not terribly great variety of not terribly interesting things in-between plot missions.
To call what the game has a difficulty curve is misleading. It's more of a keep-'em-guessing zig-zag of occasional inevitable doom. This is not entirely because of a parade of non-critical bugs & glitches that do things like simultaneously spawn every enemy wave in a mission on top of a mission critical target, and spawn you where one of the enemy waves were supposed to come from. But bugs like that certainly help screw with the difficulty. Worse, though, is that the game has a metric ton of mindless filler combat that won't tax you in any conceivable sense. Well, except maybe your patience.
The setting is reasonably well realised and deeper than it had to be, which is nice. Even if it sometimes gets lost in word salad.
Where SG is similar to Space Rangers, are the VOs and the gibberish. The quality of the dialogue (which there's tonnes of) is mostly passable, but in a few places clearly done by Babelfish. The VOs - all the VOs - are done by stars of the same calibre as the guy who VO'd SR2's intro. To some people this is deeply off-putting, and I guess I can't blame those people. Personally I find it oddly charming and often hilarious. And unlike in SR2 where the gibberish really did make a few things a guessing game, SG1 is never so bad that it doesn't get the critical stuff across.
SG2 seems like it might be pretty decently polished, and the devs have clearly been listening to the players so far. So... Whenever I get around to it - and I will - I expect it to be a far better game.
It should be possible to get SG1 for cheapsies these days, though, so if you're curious I'd throw 5$ at that and consider it a prototype kind of experience of what to expect from SG2.