SKC drew 4-4 with the Dynamo in an eight-goal thriller at BBVA Compass Stadium on Saturday but Vermes was not thrilled with some of the specific points of his team's performance.
Benn Feilhaber's second goal of the night in the dying stages helped Sporting land a point but Vermes indicated that his group of players need to improve overall.
"In a lot of respects, we didn't deserve to get anything coming out of here," Vermes told reporters.
"The only thing I'll say is that at that moment, during the course of the game, we were very good and we didn't give up.
"When we went to 3-3 and they kicked off, we should have went after them," Vermes added. "We should have really went after them, and we did not. That's why all of a sudden, they started controlling the game, but we were up a man and we should have went after them right on the kickoff.
"We did not, and that caused the fourth goal, and so here we are and here we sit. It was a great way to get back in the game and get a point, but in the end it's not good enough.
" right now, it's about putting together a 90-minute performance, and doing all the things you need to do over the course of that 90 minutes. And we've still got to work towards that."
Krisztian Nemeth opened the scoring for SKC in the second minute before Giles Barnes levelled for the Dynamo nine minutes later. Goals in quick succession from Will Bruin and Barnes had Houston 3-1 to the good prior to Dom Dwyer's 74th-minute effort had Sporting in with a chance.