Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk ( volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet ) -- Marlin Business Services (Nasdaq: MRLN ) has been upgraded by TheStreet Ratings from hold to buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures, impressive record of earnings per share growth, compelling growth in net income and expanding profit margins. Although no company is perfect, currently we do not see any significant weaknesses which are likely to detract from the generally positive outlook. Highlights from the ratings report include:.