I play PokerTH 0.7.1 offline only. I think the deals are not random. Too many high cards and 2s. Too many straights, flushes. Short stack seems to be given an edge. When a pair is flopped, somebody has a matching card to give 3 of a kind almost half of the time.

If I had the right tools, I guess I could find where they do the randomizing and re-randomize. It might be less exciting initially, but I would like to see random deals.

This is about Local Game
Interface is good.. and good for beginners.. The logic which you implement makes the game predictable, if anyone has played for some time..
Examples,
If Some one puts a 220 or 240 in the beginning round, it is an Ace, Ace.
There is an extremely high livelihood (about 70-80%) of last card being an Ace, if you have done an all in in the in before you see the flop.
There is a very high likelihood of a same number card in the flops (e.g. 7s,7d) when you have a good hand (e.g. as,ks or 10s,10d)
You need to implement the logic in order to have proper randomization in card and better unpredictability in the bets..
Hope my comment will be useful to turn an good game into a better game...

I think all the cards that are and will be in play during a hand are determined (or picked or generated, call it what you like) before the first bet is made. No matter how good (or bad) the randomization algorithm is, it's not programmed to favour anyone anyway, it does not depend on information about any bet or on the perceived strength of any player's hand. It has been discussed a few times on the forum, if you like I can look up some threads.
The AI might be a bit predictable in its actions sometimes, you may have a point there. That was also discussed a couple of times on this forum.

There is an extremely high likelihood (about 70-80%) of the last card being an Ace, if you have gone all-in before you see the flop.
Some might say that this, even if it's true, is a good thing because it means that people who do an all-in pre-flop with mediocre cards (lots of complaining about that) will lose more often to better hands