Really don't mean to offend anyone, but I can't imagine someone finding training mode "boring". You're boring. And lacking in discipline.
I've always seen training modes as a blank canvas to exercise my imagination within the limits of a game's engine. That's productive for myriad reasons, within and beyond the precincts of the game itself. Exercise of imagination and discipline work in concert to make you a better human being. This is part of the value I see in playing games competitively. I don't mean to moral grandstand, here: I believe this.
Training mode is for that kid that stays at the local basketball court, well beyond the designated park hours working on his shot and his first step, while everyone else is getting ready for school/work the next day. In the dark, when the lights are out.
Training mode begets a physical and mental fitness that is engendered by regimen. Just like anything else that rewards discipline. People don't get into shape despite having gym memberships because they can't conjure the discipline to exercise the mechanics of their body. Same shit.
*edit*
Not calling out anyone in particular, it's just a sentiment I've expressed plenty of times in this thread, which I find bizarre to see here, of all places.