I'm a habs fan. De La Rose had a strong end of the year last season. Since we had tons of injuries, he ended playing up in the lineup. He was, at least to me, much better there then when he plays on the fourth line. He was able to take up rebounds and do basic plays, which got him a few more points than usual. He was also reliable defensively, hence why people where expecting a bit more during the pre-season. If I were the wings coach, I'd try him with some more offensive player who can drive up the play. Maybe he could build up from last season in that way. However, I expect that it could take a while until they try this because he really doesn't look like the type of guy you want to put on an offensive line.
On the more negative side of things, during the pre-season he showed absolutely no signs of having evolved as a player. Is biggest flaw is that he is definitely not going to drive offence. People don't call him black-hole for nothing. Being a center you'd expect that he would have some sort of playmaking abilities, but he seems to have none. People comparing him to Eller are far off. To me, Eller also had a very poor vision and offensive hockey IQ. However, he was very driven to be an offensive player and he had good hands. He just wanted it more than DLR.
Regarding my own speculation, I think he might not be as good defensively as people say he is. He takes so few chances offensively that I think he may somehow "cheat" defensively by always giving more effort on the back check and never being too high in the offensive zone. He's a very forgettable player though, I may be off on this one :p