ITT: We complain about our internet and blame the backuploader/Nintendo WiFi. I gotten matches non-stop for weeks with Mario Kart Wii. A lot of worldwide matches. Especially when I read the thread and I wanted to check.
And don't feed me BUT THE SERVERS MRBUBBLES! If I have been playing matches non-stop with no disconnection errors since 2 weeks, it is not a "Nintendo" problem. It is your problem.
Edit: Let's be helpful.
I run Mario Kart Wii on Backup Loader .3 (obviously). It doesn't matter which version of .3 you play. I haven't been disconnected and nor have I had any error messages for the 2 weeks I've played it. I'm running on DSL and my Wii isn't being port forwarded, it also isn't on DMZ.
There are times where the servers are down. And that only occurs VERY RARELY. Slowly now, they only happened very rarely. And the servers are down, you cannot even connect on WiFi, you would get an error code around 2000s. Since the TC said he can hook up online but can't find a match, it is not a 'server' problem from Nintendo.
If the servers are all down, you cannot go online at all. I know because I seen it happen with Brawl and Mario Kart Wii, everyone on the GameFAQs forums reports it and we can't even go online to find a match.