Sorry, Gwazi, but I don't think you can say that. Just because he is using different custom objects than you would doesn't mean they are bad. That is a matter of taste you know.
From dcornel's object choice I get the impression it is very carefully made, because I see objects from many different sources. You might not like some of his choices, fair enough, but that doesn't mean the're "bad", only not of your taste!
Although you are new here, you obviously aren't new to RCT, Dave! This looks like work of an experienced RCT player! I like the idea of the park and sofar it is very well executed.
Indeed, some foliage and some landscaping would be a good idea.
Mama Bear
Coming from you that is amazingly high praise, and I am really happy that you took the time to look at my park, since I've seen so many of your parks/designs, and you are one of the people who showed my what the game was really about. Thank you.
DAVe
Pretty good. You should learn how to select custom objects, though, because some of the ones you are using are pretty bad. 
I respect your opinion and appreciate the feedback. The irony is; I have created about 7 saved games to scenarios in this park, and each time I've either included something missed, or as is mostly the case, modified things to fit my needs. I'm pretty happy with my objects, but I'd love to see what objects you are reffering to. Keep in mind, I build mostly in 1/4 blocks that can have features attached forwards and back. (Did that make sense? Basically I'm talking about being able to overlap features on my walls.)
Take care.
DAVe