So I have limited internet and while I can log in and play solo, playing in open is generally not an option for me. (Not to mention I hate gankers with a passion.) So the question is, before I spend a crap load of shekels for Odyssey, will it be worth it? I can't tell if it is designed more for MMORPG style or if it's balanced for playing solo or with just a couple friends. Simple question, but I love the idea of being able to exit the ship and walk around as well as land on planets with atmospheres. I remember my Frontier days, exploring strange new worlds and seeing the life on the surface as I skim the surface.
Remember that the mean player population of an inhabited system at any time is about one, maybe a bit more at busy times, and then there's all the uninhabited systems too.
Odyssey is then increasing the amount of usable by space by adding a bunch more landable planets, station/building interiors, etc. so all those sparsely-populated systems are now even bigger.
Almost all the gameplay has to therefore be doable either solo or at the biggest in a wing - or for things like CGs, as a large collective group but still with no requirement to physically meet up.
I'd be very surprised if any of that would change in Odyssey or - indeed - if Odyssey is anything other than "more Elite Dangerous, this time on foot" (in the same way that Horizons was "more Elite Dangerous, this time on planets"). So if you like Elite Dangerous, you'll probably like the Odyssey bits too. (Equally, if you don't like Elite Dangerous, Odyssey almost certainly won't fix that)
But: there's no point in pre-ordering it either [1], certainly not now - you're not going to miss out on anything other than a cosmetic which you might not use. Wait for more previews, wait for people to show things out of the Alpha (and Beta), see what happens, and pre-order it a week before release if it looks good to you by then and you want the bonus cosmetic.
[1] There are a few exceptions to this - if I didn't already have Alpha access from my LEP, I'd probably buy it anyway, because I maintain a 3rd-party tool and early first-hand previews of new stuff are really useful for that. But most people don't need that.