I have been on a old Grampians. gate valves used as sea cocks, no holding tanks, there is more to worry about then just the missing sails.
hmmm, that would depend on how you're intending to use the boat. I don't know of many 23' boats with holding tanks, and I need the flexibility of taking the portapotti ashore to an outhouse where there are no pumpouts.
a properly maintained gate valve works fine. if it's a huge concern, replacing it isn't that big a deal.
I find my G23 sails very well except in very light air. I don't race, but in decent wind it's faster than other Tanzer 22's I've encountered, and I've beat much larger boats upwind that were being sailed inefficiently. It sure doesn't look like a fast boat with those squarish aft sections, but it seems to work. We bought the boat to cruise with our two kids and were looking for the biggest bang for the buck. 4 years later I still can't find a better alternative, certainly in that size range.
I have recored some of the deck and need to do more. This is probably a given if you buy one of these boats.
It will be difficult to buy a used mainsail for this boat; I just got a new one for ~900$cdn. If you have scrounging skills, the boom shouldn't be a big deal.
The cockpit is small. The tradeoff is that it has much more cabin space than alot of boats in this size range.
Trailer launching is a pain. This is partly because I have a crappy trailer, but it will never compete with a MacGregor for trailering ease.
I'm not saying the boat is perfect, but this boat does have alot of good features that I couldn't get/afford on another boat.