Boarding in 0.6x was hideous, enough that few posters here got banned for their uncontrolled outrage. Chance of success for hard dock and boarding a useful warship was 37.5% at best. (25% self-destruct, then 50% chance of success afterwards.) If you were lucky, you board on the first try. If not, you could spend over an hour replaying battles and fail boarding attempts more than ten times in a row (each with 37.5% chance of success) before you succeed. Assault teams only had 9.375% chance of success and required too many marines to be a viable option. I abhorred boarding during the 0.6x era once I experienced multiple failures in a row even with the most favorable save-scumming conditions.
Oh, I won't argue with the numbers being horrible, I just miss the greater range of outcomes. I thought selecting a boarding craft was kinda' fun*, and a ship self-destructing during boarding or being damaged beyond repair always felt right to me. It adds a little bit of flavor that fits perfectly with the feel of the game. IMO, the problem wasn't with the fact they happened, but the frequency with which they did so. I'd really like to see Alex tweak the numbers to be less punishing and restore those features to the game.
*Granted, once I really understood how it worked my boarding craft were almost exclusively shuttles and small freighters, so when the inevitable explosion happened I was really only out the marines rather than the marines
and one of my combat ships, which was apparently a lot more of an issue for other players.