Historically Chelsea and Manchester United have won lots of stuff, but also had a much much much stronger squad than Spurs. And yeah, winning the FA cup last year, and the League cup this year is good, compared to the level you have played at. However, I think it's unfair to level this criticism based on one bad European run with this current group of players and manager who have seen constant improvement.
If we analyse this year, we lost / drew a few games where we were the better team, and based on overall play we shouldn't have been out. But truth is, we didn't perform where it mattered, in front of goal. It should also be said that this was at the time when we had lots of injuries, and weren't playing well in the league either. Regarding Gent, we absolutely dominated them in both legs, even with 10 men, I can't believe they won on away goals, but that's how it goes sometimes. I'm not trying to make excuses here; but throwing in such intangibles as 'winning mentality' based on very little evidence just seems lazy to me.
Guess time will tell
I remain an optimist and hope for a top 3 finish, and we're not far away from a FA cup final either. Our season can still be very good.