Forums, by nature, contain issues that people are looking for a solution to. They're, generally, for problem solving and therefore you see "lots of problems" when reading through them. I've never started a thread that said "2004 TW200, base gasket still good". It may seem they ALL have issues because you see issues a lot on here, but, I'm with Gerry, if all of us without issues posted we never had issues then the pendulum would swing in favor of it as a non-issue. But yes, that year is known to have an issue. How much of an issue, I don't know.
And to boot, if it does affect you it's not a hard fix. Go for it and budget a fix if you ever have to cross that bridge.
Usually what happens with me is I get hesitant because of known issues but then finally make the purchase only to crash the thing and have bigger fish to fry.