Well, point your browser to: buddler.noip.me:9172 (copy => paste)
there you can see a hashrate for every miner connected with far more detail than a classic pool.

the "fragmentation"... well, you have to start your wallet to get your earnings even for a normal pool.
if you join a p2pool the main diff is that you just get your reward in smaller pieces and your wallet shows them as "mined".
if you click on the small box behind a vtc-address on my pool you will be redirected to a vtc explorer and can easily check your earnings one by one.
p2pool just needs ~24h to really get started for your payouts to reach max amount.

i like p2pool cuz of the decentralisation factor.
and i really like the "mined" symbol in my wallet... gives me the feeling that i really earned the reward

dont get me wrong, i mined on coinotron too but had some heavy lags there and lost ~10-20% of my hashrate...
but other than that coinotron seems to be one of the more stable pools with no trolls/thiefs as admins.

nevertheless: happy mining!