The combination of information paints the most complete picture, especially on a thinner stock.
Bid and ask size don't mean as much on a heavily traded stock, where only a small percentage of the days total volume will have been posted by the specialist. On a thinner stock one can often see the quantity shown in time and sales simultaneously disappearing from the bid or offer.
As was pointed out here earlier, some stocks are just very difficult to read. For some reason the specialist's behavior is not always consistent, or is misleading. In one stock I watched for awhile he generally showed size on the bid when the stock was going down, and size on the offer when it was rising. Trying to pull in buyers or sellers to help him move the stock he had to buy or sell. Reminded me of liars poker.
Keep searching. I have found a stock where the size posted on the bid and offer has integrity. I also watch the prints, are they green or red? What is the trend? What about their volume?
Is the stock/sector strong or weak for the day? I love to short w/bullets, but if the trend is up I won't get much, it's more forgiving to play the long side, less risk.
What is the overall market's momentum? If the market slows down or stalls, how does my stock react? Does it slowly roll over, or do I need to anticipate and be quick?
It's kind of like being with a woman... if you spend your time with one stock you can get to know it very well. If you get along, great! If not you're better off to find another one.
Yes it can get boring at times but by watching and being available you learn to recognize a good opportunity and act on it. I like to trade small lots often to get a feel for the action and keep my head in the game, and then take a bigger position or add on when a low risk situation presents itself.
Candle's opening questions are great, I wish someone would answer them all
Swing (a misnomer, actually a daytrader)