Probably the game against West Ham was really very bad for Chelsea, but still we can say that West Ham are playing very well now... Chelsea managed to draw with Liverpool in the first match of this season, so you can't say that they are bad now... I think their game will be better this season... There are a lot of changes at the club, which should have a good effect on future matches...
Successfully holding Liverpool to a draw in the first match but losing to West Ham is not exactly that looks very bad for Chelsea even though in terms of strength West Ham should be far below them.
Even though the EPL is difficult to guess but with a failed Penalty and West Ham adding goals in conditions they play 10 people it indicates that Chelsea are not fine. And even though the defense is only 2 matches but 1 draw and 1 draw is not a good start for Chelsea who are trying to improve the club and in fact the overhaul and coaching changes have not felt the impact until now.