I saw the matinee as well with Shevchenko/Forster. I agreed that Forster was a little lackluster in Act 1, but seemed to gain confidence through the rest of the ballet. His partnering looked very strong in general and especially in the balcony pas de deux.
I thought Shevchenko was very good. Technically she was secure yet light on her feet. I thought she also did a good job dramatically, though I do wish she showed a little more passion towards Forster. Similar to another commenter, I felt it was more of a presentation to the audience rather than an intense connection between the pair.
I see a ton of potential in Gonzalez as Mercutio, but his performance was unfortunately technically shaky which surprised me. He bobbled on several turns and just seemed a little nervous overall. But his wit and energy was spot on, and with more practice I believe he will be an excellent Mercutio.
Joey Gorak did a good job as Benvolio, and I wish him well with his next chapter. I thought the 3 harlots were great and really played up the characters well.