I'm playing on Patch 1.5 Hotfix, and although the game is slightly better from launch, I'm still experiencing inconvenient bugs, immersion-breaking bugs, and full game crashing. There are people teleporting in and out right in front of your eyes, and hundreds of people seem to wear heelies because they glide around instead of walking, There are also delayed sound effects, with gunshots happening up to 30 seconds after firing, or just never happening at all. There are times I can't perform stealth kills because the game just doesn't give me the option. Not to mention, the game will still occasionally crash and close completely. Overall, even after patch 1.5, I'd still recommend waiting.
