Okay, I've played for about an hour, so here are my thoughts.
Overall, I'm enjoying it, but if I compare it to RE2 (the remake), it strays into uncanny valley territory. As in, it looks similar, it plays similar, but it doesn't take you long to notice the differences.
First off, the zombies are much weaker. I'm playing/played on normal difficulty each time, but whatever the case, zombies go down much more easily here. In RE2, you could down zombies, even with headshots, and the bastards would come back for more. Here, I'm popping off headshots, and making zombie heads go pop as well. Consequently, I've got no shortage of ammo. In RE2, for most of the game (well, at least the A scenario), handgun ammo was at a premium. Here, I suddenly came to the realization that I'd played less than an hour and had 60 rounds. You could attribute this to me taking the lessons from RE2 and applying them here, but I don't think so. They're zombies. I know to make headshots. Headshots have been a part of the series from day 1 in some form or another. Here though, the zombies are weaker, and there's more ammo to deal with them. I've seen it suggested that the headshot factor is to represent how Jill, as a STARS officer, is a better shot than Leon or Claire, and while that does make sense, I doubt that's the rationale behind it. But whatever the case, so far, there's more ammo and weaker enemies than RE2. And consequently, while both games have a 'dread factor,' RE3's kind of lost it already for me. I can't really call that bad, per se, since RE3 makes it clear from the start that it's different in RE2 (RE2 starts in an abandoned gas station, RE3 starts with explosions, fire, Nemesis, and hordes of zombies), but it's a noticable shift in tone.
That said, this isn't an action game. It isn't even a game in the vein of RE4. What I mean by this is that in RE4, you faced hordes of Ganados, and a lot of the time, you had to keep on the move. Take the village at the start of the game - best method is to pop off some shots, move when you have to, rinse and repeat, and the ganados are reactive to where you shoot them. In contrast, RE3 still encourages you to take your time. Stand still, let the icon close in, fire, repeat, move only if you have to because it's going to bugger up your aim (like RE2). The encounters are still slower, so the game doesn't cross into the 'action' side of the franchise. Or at the least, despite what I said, it has more in common with RE2 than RE4.
Oh, and minor notes, I love the easter eggs scattered around. Like, there's movie posters everywhere, and they all reference a Capcom IP or schlock horror. But on the flipside, the characters? I dunno. Dario gets a 1 minute appearance, though you can try talking to him instead of running on ahead, in which case he'll use lines from the original RE3. Which is weird, because they're the same words, but without the hammy voice acting, they sound off. Also, Brad. I'm torn. Like, part of his character was that he was a wimp, whereas here he's not a wimp, and while it establishes effectively that he and Jill are close colleagues, it's jarring to see Brad be so different from his RE3 persona of a guy being on the edge. And as for Nemesis? Fuck's sake, don't throw Jill around, just kill her. God, lethal B.O.W. my arse. And Jill herself? Well, I'd tell you more, but it's lunch time and I'm going to make myself a sandwich (actually, noodles).
So, yeah. It's decent, but overall, I prefer RE2 so far. Better atmosphere, slower paced, harder, etc. Still, early days yet.
Oh, and Resistance? I tried a match. I died. Quickly. We all did.