Git drawbacks?

Hi,

Sorry if I selected the wrong place to discuss the drawbacks of the Git. Just point to the proper one...

I'm just trying to select the best VCS for me personally. I have a very small experience with Git but I see is also not very sutable for me.

First, it seems to be very hard to setup some really big project (like Android, 
for example). Otherwise, why do they need to invent 'repo'? What purpose it 
solves? It looks like it
1. Integrates few subcomponents (projects) and checkout the code in the proper 
configuration. The question is why this is not the Git task? For me, it looks 
like the ClearCase client spec.
2.? What others (except integration with review tool)? 

The next issue with git is its clone. Why do I need the whole set of revisions? Why do I need to get 1GB of Android? You could say this should happen once. I would agree but when I tried to resync the Android tree after 2 months, I was struggled with many errors (both git and repo). Finally, I had decided to sync again. :-) There is one point against clone. The typical situation in my office is to have few Perforce clients with the same or slightly different code. This is just wasting a space since you need them all but versions of many files are the same. I'm trying to imagine the same situation with Git. Are there any benefits? It seems, no. Moreover, I will have not only few working trees but few repository clones!

It is obvious that configuration management with Git is very difficult (for ex, http://groups.google.com/group/repo- discuss/browse_thread/thread/2fa368ed7cac5d79/64ced51656240ddc? lnk=gst&q=create+android+bare+repository#64ced51656240ddc)

Let's consider the foolwing use case. Suppose I'm intending to create a new product that consists of specific versions (or branches) of some subcomponents (or directories). How can I do this with Git? Subsequent changes could either be submitted to the appropriate component branch or branched to the new one (this way is possible with Git, of course, if I will branch the code I need to this new branch).

So, I'm wondering, why Git (or any other VCS) is not trying to solve these problems? Perhaps, there is a simple solution with Git I'm not aware of?

Here is the wish list for the VCS I would prefer:
1. Atomit commits
2. The possibility to get any slice of the code repository with the possibility 
to commit my changes on tip or on separate branch.
3. The minimum footprint of the same code on my local machine.
4. No code/history on my machine untill I really need it.
5. Easy mirroring and replication

I would say, ClearCase might be my favorite if it is not commercial. :-)

Dmitry