Hmm... Well I find oceans a great feature to the world of Minecraft. I am not saying it's a bad idea, i'm sure some people will enjoy this mod! But did you delete water in Oceans, or just remove water completely?
Something I would add would be forcing grass to grow/spawn where oceans wouldn't be. You would have some deep and flat lands to build on.
This is definitely one of the more creative "my first mod"s that I have seen. instead of just new set of tools or such, you actually changed something that I haven't seen other mods do. I don't really a have a use for this personally, but its still a cool mod.
Something I would add would be forcing grass to grow/spawn where oceans wouldn't be. You would have some deep and flat lands to build on.
As of now, it's a bit too ugly ...