Here I'm giving my opinion about those "What a good time to log in" type of comments:
It's kinda become to this site what "first!" comments are on YouTube.
at least on YouTube those get buried by newer and higher rated comments. while here comments are exclusively ordered oldest first, so "i piked the perfect time to log in" is the literal first thing you see when looking at comments for some posts. (which is now so redundant / annoying / pointless)
It's a problem because generally nobody cares that you were lucky enough to log on to see this animation and comment before everybody else. It's also pretty annoying and not very useful to say. In fact it is actually saying "first" without saying "first" as much as it is saying "I like this" if we're going by implications.
That's what I think about this type of comment, you can share your opinion if you want too. For me I'm done saying my point of view.