I, for one, don't like the seals. They are cheap ways to make you buy gems in order to get the required score for the card. I never had a problem hitting the mark until this happened. I could hit the boss once and get random sealed everytime. If not sealed, then brutal hit.
I couldn't tell you the last time I had a less than 300 score against the boss but I can tell you that I'll never hit that low ever again. Mainly because I quit.
The way it's been going with these stupid seals, it was only a matter of time. Told myself when the seals get thrown into guild war(and I knew they would because its an easy way to change the difficulty and make us pay more) I was retiring. I'm not the only one, my friend list was getting full of people not being on in days.