I kind of agree, but don't think it's gone down hill. With girls coming and going there will always be times when the mix isn't that great, or that you (as in everyone) don't like the personalities of this particular group. I think it's a strength of RLC actually, that these two apartments change over time. Sometimes it's great, sometimes less so. Always different. And with several thousands of viewers (I assume, haven't counted) it's impossible to find a group of three that will make everyone happy.
When it comes to what Belle and Rose looks like I think Belle can be attractive, stunning at times, but she has this weird smile when she's really happy that makes her look like a 10-year old which to me is really off-putting. I haven't seen enough of Rose yet to form an opinion but she looks good so far.