Nintendo Switch Review: 6 Ups & 4 Downs
3. Joy Con De-Sync Issues
How this made it through testing I'll never know, but the left Joy-Con (used for movement in single-player games and for... everything, if given to another player) very frequently loses track of the Switch itself when docked.
Portable mode is totally fine, but if you've got the Switch on your TV and are sitting across the room, even resting your fingers over the shoulder buttons will block the 'eyesight' the Joy-Con needs to 'see' the Switch, yet this doesn't effect the right Joy-Con whatsoever.
It's not just fingers either - doing anything other than holding the front of the pad 'towards' the system can result in the same issue, as can placing any objects on a table, having a wifi modem nearby and so on.
Worse still, when the Joy-Con is losing connection, it won't tell you, but will carry on whatever the last command was, making many games unplayable, costing you a valuable attempt at any precision-based section of gameplay if your character wanders off the level to their death, or you crash your vehicle last minute.
The hope is that Nintendo will patch this (somehow), but so far all they've done is acknowledge it's an issue, before asking players to stay away from all potential sources of interference, including, weirdly, an aquarium.
But hey, if you live in a shed and play about a metre from the TV, you're gonna have a blast.