I will say to the OP what I would say to any new or recurring player - just give it a go. People will always wave a paintbrush (positively or negatively), yet neither is an accurate representation of how YOU will feel about it, because the above are personal opinions. If you get a random urge to try X again out of nostalgia, there's nothing stopping someone from just installing and giving it a go. I never have and never will be swayed by other players when it comes down to games - if I want to play it, that is typically more than enough for me to just play it.
If you choose to do so (especially out of nostalgia), then I highly recommend the Equilibrium server if the bonus-mode is still active. You'll be given every boost under the sun and can level to max in a day or two, giving you the perfect means to breeze through the old content you remember for a nice and easy nostalgia trip before hitting the meat at the end. If you choose to stay, there's plenty of affordable options now to give you the staying power. If you don't, well, you got your slice of nostalgia for free - and more than enough time to figure out for yourself how you feel about it all.
Regards,
Mhul